I am sure most of you have realized the fact that when you unplug the Tab from the charger, even it showed fully charged, the battery drop right down to 99% or 98%, which is not that normal with other android phone.
I took a deeper look here. I have a widget which can monitor the battery voltage. When the Tab is connected to the plug and fully charged, the voltage is showing at around 4150mv, which is the normal fully charged voltage for most of the android phones. The moment you unplugged the charger, the voltage drop to around 4070mv. I guess most of the phone judge the battery level by voltage. The differences of the voltage makes the battery level drop to 99% or 98%.
Another fact I found is that the voltage changes quite a lot when the Tab is on different loads. A simple example is that when I wake my Tab up from a sleep mode (black screen to desktop), I can see that the battery voltage widget showing a 100mv drop. (This can be easily reproduced, just put a battery widget which can show voltage on desktop, lock your screen for a few minutes, after that unlock your Tab and keep looking at your voltage for a few seconds, you will notice the difference).
I basic Physics tell me that this kind of voltage drop is cause by the running current and the internal impedance of the battery. But still I am not so sure about the 100mv drop is normal or not? It is bigger that is should be (causing by the not well made battery which have larger than normal internal impedance)?
Sorry for the English style, it is not my mother tongue. Thank you. More discussion is welcome.
I also notice the last 10 or so percent going in minutes
nothing either of you are describing is abnormal behavior for Lithium ion cells.
almost all of this has been discussed ad nauseum.
crazy talk said:
nothing either of you are describing is abnormal behavior for Lithium ion cells.
almost all of this has been discussed ad nauseum.
Click to expand...
Click to collapse
Well, there you go
Theres another mystery to be resolved. How come a two amp/hour charger needs four hours to charge a four amp battery instead of the aprox two hours it should take?
Sent from my GT-P1000 using XDA App
Tiamath99 said:
Theres another mystery to be resolved. How come a two amp/hour charger needs four hours to charge a four amp battery instead of the aprox two hours it should take?
Sent from my GT-P1000 using XDA App
Click to expand...
Click to collapse
The charging current is not constant. The maximum is 2 amp. But this is probably available when the batter level is very low. As the batter level goes up, the charge current goes down. Meanwhile, the charger would provide power for the device to operate if you were charging it with power on, which uses some of the amps.
The explanation does not satisfy me. It would certainly explain why it charges in a little bit more Time than expected with the 2 amp charger, the problem is that the charging time is about four hours, that's double the time needed for charging.
For example the Archos 70 internet tablet has a 3000 miliamp battery and a 2 amp charger. Time to full recharge? 90 minutes.
As it should be.
Sent from my GT-P1000 using XDA App
Charging current is usually lowered for example when battery overheats while charging. Also, if you use the device while charging, then of course you are slowing down the charging as well.
Tiamath99 said:
The explanation does not satisfy me. It would certainly explain why it charges in a little bit more Time than expected with the 2 amp charger, the problem is that the charging time is about four hours, that's double the time needed for charging.
For example the Archos 70 internet tablet has a 3000 miliamp battery and a 2 amp charger. Time to full recharge? 90 minutes.
As it should be.
Sent from my GT-P1000 using XDA App
Click to expand...
Click to collapse
Hmm, the Archos is not telling the whole truth. It'll try to explain what I know. Lithium based batteries have a two stage (some people say three!!) charging process.
The first phase is the constant current phase, this pumps in as much current as possible (within the constraints of the charger, battery size, battery temperature etc). So with a 2 amp charger the full 2 amps will hit the battery, probably less if the device is switched on as the device will take some of the power from the charger.
The first phase continues until the battery voltage is about 4.1 or 4.2 volts then phase 2 starts. At this point the battery is probably about 70-80% charged. The 2nd phase is a constant voltage charge and will take the charge from 70-80% up to 100%.
The 2nd phase is what takes the time, as the voltage hitting the battery is now fixed at 4.1/4.2 volts the charging current steadily reduces as the battery becomes more charged. Therefore it may take 20 minutes to get from 80% to 90% charged but 40 minutes to get from 90% to 100%.
There is a small graph on the bottom of this web page-
http://shdesigns.org/lionchg.html
So why do some devices take longer to charge then others? Apart from different chargers & size of the battery the other main factor is the charging circuit in the device. Some devices do not do the slower phase 2 charge resulting in a battery that is only 70-80% charged, the device will of course tell you it is 100% charged but it is not, so for example out of the 3000mA/H battery in the Archos only ~2500mA/H will actually be availble. Other devices may push the charge voltage on the phase 2 charge to make it quicker - this is seroiusly bad for the battery though.
Make sense??
faugusztin said:
Charging current is usually lowered for example when battery overheats while charging. Also, if you use the device while charging, then of course you are slowing down the charging as well.
Click to expand...
Click to collapse
Right but when you charge it with all apps closed and the screen off the power consumition is minimal so it shouldn't affect the charging time very much.
Sent from my GT-P1000 using XDA App
m2te said:
Hmm, the Archos is not telling the whole truth. It'll try to explain what I know. Lithium based batteries have a two stage (some people say three!!) charging process.
The first phase is the constant current phase, this pumps in as much current as possible (within the constraints of the charger, battery size, battery temperature etc). So with a 2 amp charger the full 2 amps will hit the battery, probably less if the device is switched on as the device will take some of the power from the charger.
The first phase continues until the battery voltage is about 4.1 or 4.2 volts then phase 2 starts. At this point the battery is probably about 70-80% charged. The 2nd phase is a constant voltage charge and will take the charge from 70-80% up to 100%.
The 2nd phase is what takes the time, as the voltage hitting the battery is now fixed at 4.1/4.2 volts the charging current steadily reduces as the battery becomes more charged. Therefore it may take 20 minutes to get from 80% to 90% charged but 40 minutes to get from 90% to 100%.
There is a small graph on the bottom of this web page-
http://shdesigns.org/lionchg.html
So why do some devices take longer to charge then others? Apart from different chargers & size of the battery the other main factor is the charging circuit in the device. Some devices do not do the slower phase 2 charge resulting in a battery that is only 70-80% charged, the device will of course tell you it is 100% charged but it is not, so for example out of the 3000mA/H battery in the Archos only ~2500mA/H will actually be availble. Other devices may push the charge voltage on the phase 2 charge to make it quicker - this is seroiusly bad for the battery though.
Make sense??
Click to expand...
Click to collapse
Wonderful explanation mate.
But still I just can't understand why it took one hour and 50 minutes to go from 10% to 60% . In theory it should be phase 1 charging at full 2 amps hour.
Since the 50% charged is about 2 amps , shouldn't it have charged that amount in an hour?
Sent from my GT-P1000 using XDA App
I've been wondering this too. I read in other reviews that it takes 3 hours for a full charge but It took me 3.5 hrs to go from 55% to 100%. sounds like samsung is very conservative with it's stages.
The first problem is something that those of us with Droid Incredible devices have had for a long time. Many people resort to bump charging (i.e., charging to 100%, unplugging for a little while, then plugging it in to let it finish charging). It's an annoying problem.
Need help here my xda fellows.
I am not sure if this is normal, but my tab drops from 70% to 58% overnight with flight mode on and no apps opened. (i use lanucher pro if that counts)
Another weird thing is when i turn off the tab and charge, that battery meter only shows about half full and no matter how long i charge it for it stays the same. But then when i fire it up, android system tells me its 98%. And when i try to turn it off and charge it, now the meter shows almost full and will eventually shows that 100% symbol.
It seems to me some ppl get excellent battery life but not in my case. Could there be any problem with the battery? (running jk1 fw non root).
Sent from my GT-P1000 using XDA App
Another issue is that once the charger hits 100%, it shuts off. While the tab is plugged in and on, it will drain the battery down some...maybe to 95%...before the charger turns back on. However the whole time it is plugged in it will show 100% after having reached max charge.this is by design on almost all new battery devices to prevent damage to the battery and simultaneously prevent people from complaining their battery is draining even though it is plugged in.
This also explains why some people see such a quick drop after unplugging. If they happen to unplug at the bottom of a trickle charge cycle.
Again, not a bug.
Sent from my SCH-I800 using XDA App
As I have noticed these issues with my Tab as well, these were all very well explained and knowledgable replies.
Just to put in my two cents, I have noticed that the Tab actually seems to charge noticably faster if I leave it on, rather than turning it off. I do, however, usually turn off everything on the power widget and put it into airplane mode as well, mind you. But, the speed in which it recharges while turned on as opposed to the recharge speeds when completely shut off are fairly noticeable.
Anyone else notice this with their Tab or any other device, and/or have some insight regarding why this occurs? Kudos for the previous informative explanations, btw.
Related
Plain and simple: When the Evo is fully charged, it begins running off its battery until you plug it back in. It DOES NOT trickle charge whatsoever after it reaches 100%. When you're using your Evo on the charger, and it's showing full 100% charge, it is running off the battery, not the AC plug. And then when you unplug it, well, we all know what happens next. The battery meter drops insanely fast to the actual charge of the battery, which could be very low, depending on how long it's been sitting idle at 100% on your charger.
So all those times you've charged your Evo overnight, only to take it to work the next day and be at 80% within an hour? Your Evo was running off its battery for what I'm guessing was most of the night. It takes my Evo about an hour to two hours to fully charge back to 100%. Let's say you put your Evo on the charger at 11PM, it'll reach full charge by 1AM at the latest, and then run off its battery until whenever you take it off the charger in the morning.
Workarounds?
1) Turn your Evo off while it's charging.
2) If you must leave it on for an alarm clock, put it in airplane mode and end all CPU intensive tasks to minimize battery drain.
3) When you wake up, unplug it for 10-20 minutes (still experimenting with this number), and then plug it back in to top it off. Once it reaches 100%, take it off the charger, and go about your day.
Try it out for yourself. When your Evo is 100% charged, take it off the charger immediately, and I highly doubt you will lose the 10%-15% within minutes. Please share your findings.
Er... Point of note, mine does it even if I pull it off the charger right when it turns green.
Post some technical schematic or other type of proof that shows that this circuitry isn't available in the EVO. That will prove beyond a doubt if what your saying is true.
That being said, only a group of the most retarded electrical engineers would design a charging system as you've described. It is INSANELY easy to build Li-Polymer charging circuitry that does the following (and it pretty much has to do these):
1. Detects battery temperature, and disables charging as a protective measure. In an emergency case it should shut off the device it's powering to allow the battery to cool down. This is a design requirement, or else your house burns down as you dump water on a Lithium fire thinking it's going to put it out. If you have a HERO, you can easily test this. Running the wireless tethering, GPS/Navigation, and Music with the screen running heats up the phone a ton. You'll notice the status light blink green once, then red a couple of times. This means that it's plugged in but not charging. Cool the phone down and it turns solid red again (charging).
2. Disable charging cycle when battery reaches a certain voltage. VERY SIMPLE voltage detection circuitry! The designer can of course adjust a gap to have charging turn back on when it dips below a certain voltage. Usually since this circuitry can be made with a decent amount of precision, that "turn back on" voltage ends up being roughly when the battery discharges to maybe 99.5%. That's just a guess, I admit but there's no harm in having the circuit switch on and off, even if it's often.
There are also a few other circuits that prevent the cell from blowing up in your pocket, like a current sensor to prevent an overcurrent. There's also some stuff that prevents you from being able to discharge the cell below it's avalanche voltage. In case you don't know what that is, when a Li-Ion battery discharges to a certain voltage, it avalanches to 0 (quickly falls). If it hits that point, you've pretty much ruined the battery and it will never charge the same again.
Anyway, this is stuff they taught and had design labs on back in college. While I have no actual proof that the phone wasn't designed as the OP describes, I find it highly unlikely. If this is the behavior that the circuitry exhibits, I would find it easier to believe that it's a design flaw, probably because some idiot didn't compile the correct bill of materials.
I haven't got any schematics or any sort of technical information on the subject. All I know is, it works wonders for me. When I take my Evo off the charger in the morning, it literally drops to ~90% within minutes. Once it does that, if I place it back on the charger for ~20 minutes, it charges back to 100% and stays there for 45 minutes to an hour.
I'd urge anybody who is noticing the immediate 10% to 15% drop in battery to give this a shot.
I would turn it off while I'm charging it overnight, but I use it as my alarm clock
Me Too
I am seeing the exact same behavior as the OP. This is really lame. Because of this, most people will end up losing 10% of their battery every day. Pretty lame.
I charge my phone overnight every night. Never noticed a problem and I just checked my battery and its at 88% and has been off the charger for 2.5hours so I'm not seeing the rapid discharge issue some people are seeing.
I don't think so man, I leave my screen on full brightness while it's charging, and if what you said was true it would go dead on the charger.
I think it's more likely the cells haven’t charged equally, so you get a big initial drop.
Grims said:
I don't think so man, I leave my screen on full brightness while it's charging, and if what you said was true it would go dead on the charger.
I think it's more likely the cells haven’t charged equally, so you get a big initial drop.
Click to expand...
Click to collapse
I'm beginning to think that once the battery reaches 100% full, it runs off the battery until it reaches some arbitrary percentage. At which point it starts charging until it reaches 100% again, and then continues this cycle.
I'm testing a few other things right now. Part of me is convinced it reports 100% charge when it's actually below that level.
Krynj said:
I haven't got any schematics or any sort of technical information on the subject. All I know is, it works wonders for me. When I take my Evo off the charger in the morning, it literally drops to ~90% within minutes. Once it does that, if I place it back on the charger for ~20 minutes, it charges back to 100% and stays there for 45 minutes to an hour.
I'd urge anybody who is noticing the immediate 10% to 15% drop in battery to give this a shot.
Click to expand...
Click to collapse
I'll try this out to see if I can get the same kind of behavior. I guess I honestly haven't looked to see if the phone drops 10-15% after pulling it off.
Krynj said:
I'm beginning to think that once the battery reaches 100% full, it runs off the battery until it reaches some arbitrary percentage. At which point it starts charging until it reaches 100% again, and then continues this cycle.
I'm testing a few other things right now. Part of me is convinced it reports 100% charge when it's actually below that level.
Click to expand...
Click to collapse
This is what should be happening I believe, but I'd be surprised if it was set to such a huge swing like 10-15%
Grims said:
I don't think so man, I leave my screen on full brightness while it's charging, and if what you said was true it would go dead on the charger.
I think it's more likely the cells haven’t charged equally, so you get a big initial drop.
Click to expand...
Click to collapse
This is an interesting theory. I do know that when you have multiple Li-Ion cells in a battery pack, if they discharge unevenly, you have to go off of the lowest charged cell. Again, if a cell were to drop below the avalanche voltage, you'd ruin the pack all together. On the other hand, the circuitry should let ALL cells charge to 100% so it's even again. Maybe they screwed this up, that design isn't so easy! Perhaps it detects one cell as 100% and shuts off the charge. Therefore, one could surmise that if you started with an unevenly charged battery pack, you'd have an immediate decrease in charge to the rating of the lowest charged cell. The good news (maybe) is that this is sometimes implemented with software. That means that HTC could release a bug fix for this, or if we have a savvy dev, they could try to fix it. We just need to prove the theory though.
This is all just a guess, keep that in mind. If I notice something like this with my phone today, maybe I can tear apart the battery and measure the voltage on each cell (if it even has multiple cells). I have a spare, so maybe I'd be up for this. Krynj (or anyone), if you have the HTC Hero, try charging your battery pack with it, see if it exhibits the same behavior on the Hero itself. If it doesn't, then try putting it back into the EVO and see if after a night of charging, it still drops 10-15% after disconnecting it from the AC.
The reason why the battery dies so fast has something to do with the memory card. Charge your phone and take the SD card out and watch it stay at 100% for a long as time. Then do it again with the SD card in and watch it dip down fast.
Apple laptops don't charge unless battery is below 90%. If you plug in the AC and the battery is above 90%, it will just run off AC power but I don't think the battery drains any then.
My battery life has been less than stellar, but I didn't notice it dropping 10-15% instantly off the charger. I did notice that it'd drop about 10% after driving to work with xiialive streaming, which was unusual to me. The battery would start running out after about 9 hours at work. I'd be in the yellow by the time I got home, and the battery would be complaining for a charge in the evening. So that's roughly 12 hours I would be getting out of the phone after normal use.
Since I'm suspecting an issue with the charging circuitry, I just recently tried charging my battery with the Hero. After it was fully charged, I put it back into my EVO last night and haven't charged it since. It's been running 13 hours, and is still nearly full green. The charge is at about 70%. I've been trying to graph the discharge all day too. It only dropped to 87% over night, dropped to 80% when I drove to work (xiialive), and then down to 74% after I spent some time setting up icons and modifying my home screen. This is...hands down a butt ton better than the past week.
I'm not using 4G.
WiFi is off.
3G is on.
GPS is on.
Not running a live wallpaper.
Sync is running at default settings.
Widgets that could be updating constantly:
I have the Clock/Weather HTC widget running.
I have the Dictionary.com "word of the day" widget.
I have the Friendstream Widget running.
Craigslist Craignotifica app is running, set to notify me with search results.
The results are inconclusive though. Yesterday, I wiped and re-flashed DamageControl 3.2.x from scratch (backed up all apps with Ti-Backup, this means Android Market won't be notifying me if there are app updates -grumble-). So, somewhere between re-flashing and also charging my battery with the Hero caused this turn around.
apollooff320 said:
The reason why the battery dies so fast has something to do with the memory card. Charge your phone and take the SD card out and watch it stay at 100% for a long as time. Then do it again with the SD card in and watch it dip down fast.
Click to expand...
Click to collapse
Interesting.....Will have to give a try. Will report back later.
I'm waiting for some definitive results with the "use another charging device or battery" method. It seems that the EVO just sucks at recharging the battery since people who have used another phone or a separate charger seem to report better results.
I leave my phone off at night and charge it - when I turn it on in the morning it still drops 5-10% in the first 20 minutes. But during the day it drops REALLY slow, so I still can get about 13-16 hours before 15% easily.
I have manual account sync, 3g only, wifi at home, usually gps is off, auto backlight settings for screen, and I don't run too many apps in the background, I just use them when I need them.
Has anybody found a solution to this? It's really starting to bother me. I've noticed that I don't seem to have the issue if I charge -> recovery -> wipe battery stats -> reboot. That kind of leads me to believe that something is inaccurate about the battery stats and the phone instead uses the actual raw value provided by the battery instead of whatever it is that it does with the battery stats.
I can tell you this, I bought two of the cheap battery chargers off of ebay and I have two OEM evo batteries. I don't even plug my phone in anymore. I get an hour of standby at 100% from those chargers and it falls instantly when charging from the phone. I just run them down then swap them out. I couldn't be happier and they are only like 10 bucks each with 2 batteries each.
Sent from my PC36100 using XDA App
jnewkirk10 said:
I can tell you this, I bought two of the cheap battery chargers off of ebay and I have two OEM evo batteries. I don't even plug my phone in anymore. I get an hour of standby at 100% from those chargers and it falls instantly when charging from the phone. I just run them down then swap them out. I couldn't be happier and they are only like 10 bucks each with 2 batteries each.
Sent from my PC36100 using XDA App
Click to expand...
Click to collapse
can you post a link or ebay or where ever u bought it from?
Try this I'm doing it from the phone
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=250641711190&ssPageName=STRK:MEWNX:IT#ht_1991wt_913
Sent from my PC36100 using XDA App
apollooff320 said:
The reason why the battery dies so fast has something to do with the memory card. Charge your phone and take the SD card out and watch it stay at 100% for a long as time. Then do it again with the SD card in and watch it dip down fast.
Click to expand...
Click to collapse
If you have apps on your sd card that are running then yes that could be the case. SD cards need power to work but I dont know how much they draw..
Is it just me or everyone else that is experiencing a super long time in charging their phone to full battery? I am running the froyostone latest build and I have already followed all the guides in this forum to save battery life. The issue I am having is that it takes many hours to recharge the battery to full when connected to a wall charger.
It took 5 hours to go from 30% battery to 90%.
*no i wasn't charging the phone with the phone turn off*
Zythyr said:
Is it just me or everyone else that is experiencing a super long time in charging their phone to full battery? I am running the froyostone latest build and I have already followed all the guides in this forum to save battery life. The issue I am having is that it takes many hours to recharge the battery to full when connected to a wall charger.
It took 5 hours to go from 30% battery to 90%.
*no i wasn't charging the phone with the phone turn off*
Click to expand...
Click to collapse
I have a stock battery, which I can charge from 25% or less to 100% in about 30 minutes to an hour. I think there is something wrong with your charger.
its actually not taking that long, it probably got to 90% VERY quickly, you just checked on it later... they're false numbers... what you need to do is this; run your battery all the way down.. then charge it for about 1-2hrs, until it gets somewhere in the 90's then, while plugged in, shut the phone down, remove the battery, put the battery back in, boot up the phone (the phone should remain plugged in) then load up WM, load up android with the hard buttons backlight on, then once it boots you should show higher than what you had before (if not 100%) from this point android will remember your charge and you will be able to go to 100% all the time now. (until you load a new rom)
10507 said:
I have a stock battery, which I can charge from 25% or less to 100% in about 30 minutes to an hour. I think there is something wrong with your charger.
Click to expand...
Click to collapse
I got stock battery also. No idea why it taking so long.
javolin13 said:
its actually not taking that long, it probably got to 90% VERY quickly, you just checked on it later... they're false numbers... what you need to do is this; run your battery all the way down.. then charge it for about 1-2hrs, until it gets somewhere in the 90's then, while plugged in, shut the phone down, remove the battery, put the battery back in, boot up the phone (the phone should remain plugged in) then load up WM, load up android with the hard buttons backlight on, then once it boots you should show higher than what you had before (if not 100%) from this point android will remember your charge and you will be able to go to 100% all the time now. (until you load a new rom)
Click to expand...
Click to collapse
I have already tried this but still no luck.
10507 said:
I have a stock battery, which I can charge from 25% or less to 100% in about 30 minutes to an hour. I think there is something wrong with your charger.
Click to expand...
Click to collapse
What kernel are you using?
Sichroteph said:
What kernel are you using?
Click to expand...
Click to collapse
I am using hastarin r8 kernel, but I was experiencing the same issue with previous versions and the default kernel.
I just tested the charging rate by connecting my HD2 to a stock charger from HTC which I borrowed from a friend. Charging was a lot faster.
Since I bought my HD2 used, the charger that came with it, is not the stock charger from HTC.
But I still don't understand what is causing the charging to be very slow.
How to calculate charging time
Charging time = capacity of battery x 1,4 / charging current
HD2 stock battery= 1230mAh x 1,4 / 1000mA = 1,7 hours
Best
leehobin
Two things on charging batteries:
1) First, make sure none of the pins in the battery compartment is bent. This dramatically slowed charging for me once.
2) Android keeps battery stats in a file that gets loaded with your build. THese stats are often wrong. Be sure to fully charge under WinMo, then with power still attached, boot into Android. This will adjust some of the stats and charging in Android should be fine then. There's a thread somewhere on more details here if you want to tweak your stats. The battery slows down its charging when it gets close to the full state. If for some reason your charger thinks the temperature is getting too high or the state is getting near full it dramatically slows the charging rate. Both of these could be erroneous interpretations of the battery data. Also, if you have an extended battery, make sure to use a Kernel that is compatible with extended batteries, like Hastarin 7.x.
Zythyr said:
I just tested the charging rate by connecting my HD2 to a stock charger from HTC which I borrowed from a friend. Charging was a lot faster.
Since I bought my HD2 used, the charger that came with it, is not the stock charger from HTC.
But I still don't understand what is causing the charging to be very slow.
Click to expand...
Click to collapse
Not all chargers are built the same. Some usb charger provide more juice while others provide less. Maybe your non stock charger came from a non smart phone...
Zythyr said:
Is it just me or everyone else that is experiencing a super long time in charging their phone to full battery? I am running the froyostone latest build and I have already followed all the guides in this forum to save battery life. The issue I am having is that it takes many hours to recharge the battery to full when connected to a wall charger.
It took 5 hours to go from 30% battery to 90%.
*no i wasn't charging the phone with the phone turn off*
Click to expand...
Click to collapse
Current Widget from the Market can tell you how many mA your phone is getting when it's charging.
this is just an approximation formula. a lithium ion battery charger is more sophisticated than this. it first brings battery voltage up to 20% safely (because any voltage below this is the harmful zone of operation), then it stuffs the battery at full capacity upto 80%. then in the 3rd stage, the current drops linearly with time.
over the past year, my stock battery gives me the following profile:
20-80% -> 1 hour (800-820ma constant, unless phone is awake)
80-100% -> 1 hour (800 -> 0ma)
by 100% i mean 0ma charge current. not 100% on the battery icon. you should be aware that the battery is still charging even after the indicator reaches 100%. but the current is insignificant (10-20ma)
even though the charger is rated at 5v 1A, it supplies only 820ma current at the maximum. this is normal. also for a lion battery the safe operating regions are around 20-90%. by safe i mean prolonging battery life. this roughly corresponds to 3.6v - 4.0v. avoid overcharging your battery frequently.
also someone mentioned current widget as a good approximate tool to study battery performance. you might also want to delete batterystats.bin and condition your battery once (i.e. fully discharge and fully recharge). this will force android to re-determine the new 0% and 100% levels. search the android forums for this.
hope this helps.
leehobin said:
Charging time = capacity of battery x 1,4 / charging current
HD2 stock battery= 1230mAh x 1,4 / 1000mA = 1,7 hours
Best
leehobin
Click to expand...
Click to collapse
silenced3 said:
this is just an approximation formula. a lithium ion battery charger is more sophisticated than this. it first brings battery voltage up to 20% safely (because any voltage below this is the harmful zone of operation), then it stuffs the battery at full capacity upto 80%. then in the 3rd stage, the current drops linearly with time.
over the past year, my stock battery gives me the following profile:
20-80% -> 1 hour (800-820ma constant, unless phone is awake)
80-100% -> 1 hour (800 -> 0ma)
by 100% i mean 0ma charge current. not 100% on the battery icon. you should be aware that the battery is still charging even after the indicator reaches 100%. but the current is insignificant (10-20ma)
even though the charger is rated at 5v 1A, it supplies only 820ma current at the maximum. this is normal. also for a lion battery the safe operating regions are around 20-90%. by safe i mean prolonging battery life. this roughly corresponds to 3.6v - 4.0v. avoid overcharging your battery frequently.
also someone mentioned current widget as a good approximate tool to study battery performance. you might also want to delete batterystats.bin and condition your battery once (i.e. fully discharge and fully recharge). this will force android to re-determine the new 0% and 100% levels. search the android forums for this.
hope this helps.
Click to expand...
Click to collapse
wow ! thanks alot !
Is it bad to let my charge over night overnight? I thought it would stop charging when it got full to avoid overhanging.
Sent from my HTC Inspire 4G
Since I have access to a a battery simulator and charger... the best way to recondition a battery is:
1. Create a low battery scenario by lowering the input voltage to just a hair above 2.7 volts (I had to create a shim to get to the battery receiver leads).
2. Boot with full 4.2 and in ClockWork remove battery stats
3. Drain and Charge battery to 4.2
I get enterprise email and I get a lot of mail daily that I have to read and respond to (150 or more -- no I don't respond to all of them), plus the phone calls, RSS reading and some texting plus a pic here and there and maybe a couple of you tube videos. I get more than 24 hours until the 15 % comes up. 50 hours would be nice but that did not even happen in my black berry with Edge only.
Mine improve 3 fold from sub 7 hours to 24 plus (yes I sleep late so probably the phone gets a 6 hour rest but the enterprise email and text is pushed down even then as I work with folks from Asia and Europe as well.
logdrum1 said:
Since I have access to a a battery simulator and charger... the best way to recondition a battery is:
1. Create a low battery scenario by lowering the input voltage to just a hair above 2.7 volts (I had to create a shim to get to the battery receiver leads).
2. Boot with full 4.2 and in ClockWork remove battery stats
3. Drain and Charge battery to 4.2
I get enterprise email and I get a lot of mail daily that I have to read and respond to (150 or more -- no I don't respond to all of them), plus the phone calls, RSS reading and some texting plus a pic here and there and maybe a couple of you tube videos. I get more than 24 hours until the 15 % comes up. 50 hours would be nice but that did not even happen in my black berry with Edge only.
Mine improve 3 fold from sub 7 hours to 24 plus (yes I sleep late so probably the phone gets a 6 hour rest but the enterprise email and text is pushed down even then as I work with folks from Asia and Europe as well.
Click to expand...
Click to collapse
How do I create a low battery scenario by lowering the input voltage to just a hair above 2.7 volts?
hiltun said:
Is it bad to let my charge over night overnight? I thought it would stop charging when it got full to avoid overhanging.
Sent from my HTC Inspire 4G
Click to expand...
Click to collapse
Yes, the "charger" that you plug into the wall is just a power supply, the actual "charger" is in the phone, and when it detects the battery is full it stops charging.
Is this the definitive way to do it?
http://hemorrdroids.net/battery-calibration/
Those steps came from here, xda devs.
1. Run the device down until it turns itself off.
2. Turn it back on and wait for it to turn itself off again.
3. Remove the battery for 10 seconds.
4. Replace the battery, but leave the device off.
5. Charge the device until full and then for another hour.
6 **Root users only** Using a Terminal Emulator, type “su” enter, followed by “rm /data/system/batterystats.bin”
7. Run the device’s battery down until it turns itself off.
8 .Turn the device on and charge for at least 8 hours.
9. Unplug the device, turn off, then charge for another hour.
10. Unplug the device, turn on, wait 2 minutes.
11.Turn off again and charge for another hour.
12. Restart and use as normal.
Quite a performance! Does it preserve battery lifespan, or is it more to do with slowing down battery drain and does it really work?
He mentions 2 interesting things:
"Generally charge them before they get lower than 50%". I didn't know that, so it's actually better to charge more often and not let it drain down?
"USB charging is actually better for the battery and you may get up to 1 hours more standby time." So you gain an hour standby but it takes twice as long to charge the phone.
Nice manual
Will try it
Sent from my GT-I9100 using Tapatalk
Some will say that its complete nonsense .
Overcharge for 8 hours ??? how does the battery not turn charging off at 100%
Recharge 50% the accepted figure is not to go below 20% to often .
They may be right or wrong their are so many contrasting views on battery charging .
jje
Discharging battery and then reloading it fully, it's the normal procedure for battery calibration for almost all the devices in the world (including computers, etc.).
Step 8 to 11 seems quite a bit strange however.
hm, just seen a different way to calibrate the battery. basically, you drain the battery, take it out for a couple of minutes, put back in, then try to turn it on to make sure it's completely flat.
then you charge it fully, then boot to recovery and wipe battery stats then drain and fully charge. so... which one is more likely to be the better?
that guy also advises to repeat that 12 step, 1-2 day long tedious procedure "every month or so".
it is lunacy honestly speaking
does it work? did he died ?
LOL I dont understand .... I just read in another day that NEVER LET BATTERY GO LOWER THAN 15% and know I read "drain drain drain" Oh welll ...
I also thought that at 100% the charging process stops.
Although this thread is about battery calibration, these questions about battery charging always pop up.
Battery calibration is the process by which you set your device with your battery data.
Every single battery is slightly different. Although there are minimum stantards to every spec of the battery, each battery is different.
Calibrating your battery is nothing more than setting your phone to the real specs of your own battery (since the phone comes configured with the battery factory standards). For example, your phone may be set to use a battery which maximum charge is 1650 mAh, but your battery has a maximum charge of 1625 mAh. That may be within the acceptable factory standard, meaning you have a normal battery, but that also means that your phone will never indicate a 100% charge after you unplug the charger.
If you calibrate that hypothetical battery, you will "tell" your phone that its maximum charge capacity is actually 1625 mAh, meaning from that on your phone's battery indicator will be more accurate.
For that reason, it is necessary to fully discharge and fully recharge your battery for the calibration process, since your device must read the actual specs (minimum charge, maximum charge, charging current, etc) of the installed battery.
I don't know about how many times this full cicle (discharging and recharging) must be performed, but that is the reason why it must be performed for the calibration to succed.
A DIFFERENT THING is the normal discharging and charging process during normal use of the phone.
In this case, you should NEVER let your battery go under 20% and, what few people know, it also should never go over 95%. This stresses the battery and diminish its life time.
Also, and there's a lot of doubts about this, the lower the charging voltage, the slower the charging process, but the longer the battery life.
High charging voltages (like the one used by the charger sold with the phone, which is around 5V) stress the battery, diminishing considerably its life time.
That is true for all lithium-ion batteries!
Therefore it is better to charge your phone through USB (which uses around 4,3V) than to do it using the charger provided with the phone.
You may be asking "If the charging voltage of the charger provided by the manufacturer stresses the battery, why does the manufacturer provide such charger?"
For purely commercial reasons! Higher voltages mean shorter charging cycles, which please the consummer. Moreover, the battery capacity loss with the factory provided charger is around 15-20% a year (considering "normal" to "heavy" use). That is to say that after a year your battery will only reach 80-85% of the maximum charge it used to reach when it was new. And by that time your manufacturer expects you to consider buying a new phone, with more features.
Summing it up:
- calibration is just the process by which you "tell" your phone what the real specs of your battery;
- in normal use, charging your phone through USB is better than doing it with the manufacturer provided charger;
- try not to let your battery charge go under 20% nor above 95%;
- if you're interested, read more about it at batteryuniversity.com
Spin three times in clockwise direction with left middle finger on your nose while blinking your eyes with the phone plugged in.
Jump in the air 3 times.
Unplug phone.
Thats some messed up instructions.
Do you have any idea what kind of strain you're putting on the battery while doing all that?
All you're gonna get is some extra minutes, maybe an hour but is it really worth it because you're just reducing overall battery lifespan by doing that procedure over and over.
Specially when you constantly keep the battery at 4200mV (full charge) for a long time. You're practically killing it by overcharging.
Transmitted from a Galaxy far far away via XDA telepathy.
m2smoe said:
Spin three times in clockwise direction with left middle finger on your nose while blinking your eyes with the phone plugged in.
Jump in the air 3 times.
Unplug phone.
Click to expand...
Click to collapse
that made me chuckle
Never done a calibration on a battery and most of the time i even didn't let battery to discarge very much and then load it again. Never had a problem with battery life it last how long it should last every time and i've used that battery for years. So the battery "calibration" are kinda useless.
Matriak31 said:
that made me chuckle
Click to expand...
Click to collapse
Well then, my job here is done
m2smoe said:
Well then, my job here is done
Click to expand...
Click to collapse
it is indeed...i should follow you just to have more laughs like that cheers
RenatoN said:
Although this thread is about battery calibration, these questions about battery charging always pop up.
Battery calibration is the process by which you set your device with your battery data.
Every single battery is slightly different. Although there are minimum stantards to every spec of the battery, each battery is different.
Calibrating your battery is nothing more than setting your phone to the real specs of your own battery (since the phone comes configured with the battery factory standards). For example, your phone may be set to use a battery which maximum charge is 1650 mAh, but your battery has a maximum charge of 1625 mAh. That may be within the acceptable factory standard, meaning you have a normal battery, but that also means that your phone will never indicate a 100% charge after you unplug the charger.
If you calibrate that hypothetical battery, you will "tell" your phone that its maximum charge capacity is actually 1625 mAh, meaning from that on your phone's battery indicator will be more accurate.
For that reason, it is necessary to fully discharge and fully recharge your battery for the calibration process, since your device must read the actual specs (minimum charge, maximum charge, charging current, etc) of the installed battery.
I don't know about how many times this full cicle (discharging and recharging) must be performed, but that is the reason why it must be performed for the calibration to succed.
A DIFFERENT THING is the normal discharging and charging process during normal use of the phone.
In this case, you should NEVER let your battery go under 20% and, what few people know, it also should never go over 95%. This stresses the battery and diminish its life time.
Also, and there's a lot of doubts about this, the lower the charging voltage, the slower the charging process, but the longer the battery life.
High charging voltages (like the one used by the charger sold with the phone, which is around 5V) stress the battery, diminishing considerably its life time.
That is true for all lithium-ion batteries!
Therefore it is better to charge your phone through USB (which uses around 4,3V) than to do it using the charger provided with the phone.
You may be asking "If the charging voltage of the charger provided by the manufacturer stresses the battery, why does the manufacturer provide such charger?"
For purely commercial reasons! Higher voltages mean shorter charging cycles, which please the consummer. Moreover, the battery capacity loss with the factory provided charger is around 15-20% a year (considering "normal" to "heavy" use). That is to say that after a year your battery will only reach 80-85% of the maximum charge it used to reach when it was new. And by that time your manufacturer expects you to consider buying a new phone, with more features.
Summing it up:
- calibration is just the process by which you "tell" your phone what the real specs of your battery;
- in normal use, charging your phone through USB is better than doing it with the manufacturer provided charger;
- try not to let your battery charge go under 20% nor above 95%;
- if you're interested, read more about it at batteryuniversity.com
Click to expand...
Click to collapse
You should post the source for your info, cause I am seeing a lot of incorrect information in here.
If you guys want to learn about your battery, visit the site Battery University
The OEM replacement battery is worth about $10.
Save yourself the stress....use it...charge it when you need to...if the battery ever fails cough up $10.
Sent from my GT-I9100 using XDA App
The way I would calibrate my batteries is a bit different. Lithium ion batteries don't need to be drained then charged to full AFAIK, and I even remember reading somewhere that draining it is actually only for NiCad batteries. It used to be relevant when phones were using NiCad but not anymore.
Read: http://batteryuniversity.com/learn/article/how_to_prolong_lithium_based_batteries
As such I have read that the universal way to 'calibrate' batteries is by charging to full, using for a couple of mins and charging again.
What I have been doing is:
1. Charge to full when phone is switched off (doesn't matter if it's from 0% or 99%).
2. Switch on the phone, use for 5 mins.
3. Switch off then charge until full.
4. Repeat step 2 once more
That's it! It seems pretty simple but it seems to have worked for me.
The way i do it is different. Firstly i have the battery calibration app from the market by Nema..then i fully charge my phone and when it says its fully charge i go into the app. There it gives me the instructions on how to calibrate...First i wait till i charge the phone without any interruptions. then click on the app and wait til the battery goes to 4200MV and then i press the calibrate button and then the app does it for me. Then i drain the battery again without any interuptions or breaks during that time and then charge it again once battery dies down and thats it.
there are so many ways being touted on the forums you really dont know which one to go for...but whatever works for each person then who are we to tell someone different just thought i share that
If my battery dies, or gets significally lower capacity after 1 or 2 years of usage, I'll just buy a new one if I plan to keep the phone longer.. Going through these rituals and painstakenly monitor my battery % so that it never goes below 20 % or above 95 % is just not worth it.. Doesn't increase the life THAT much anyway.. I use the phone until I hear the beep for low batt, and from there until I have a charger available.. Most of the time it's before it reaches 10 %, thats good enough for me.. Once in a while it might even go so far that it dies.. Then I charge it till it says 100 %.. Most of the times I plug it when going to bed, and let it charge over night.. This is normal usage and what the battery should be designed to handle, and so far it does..
Should I charge it for like 10 hours, then play with it? or you think its ok to just start playing out of the box.
I've heard stories..where you should, and where it's not necessary.
Thanks
lin013190 said:
Should I charge it for like 10 hours, then play with it? or you think its ok to just start playing out of the box.
I've heard stories..where you should, and where it's not necessary.
Thanks
Click to expand...
Click to collapse
Mine came nearly full. I just plugged it into charger out of the box and played with it while it was charging
Sent from my Nexus 7 using Tapatalk 2
With any new phone I always play with it till it dies and then plug it in and charge for 8 hours and then power it on and good to go
Sent from my EVO using xda app-developers app
Hmm, I see.:cyclops:
With every electronic gadget using Lithium-ion batteries nowadays, it doesn't really matter how/when you charge it.
Some would argue to make sure to allow a full discharge from a full charge from a battery calibration point of view, so the battery meter is more accurate. It wouldn't affect the health of the battery itself either way.
Things like memory effect doesn't apply to lithium-ion. How often you charge it and how much you charge it (full or partial charge etc.) doesn't affect it much either. The only 2 things that can potential kill a lithium-ion is high temperature and letting it discharge far too low to the point that it cannot be charged up again. Note that all electronic devices will power off way before it even reaches this threshold.
What makaijin says is correct
I had mine a bit of a charge yesterday but it was no where near full.
Used it till it was flat this morning. It's currently on charge and I'm going to leave it till it's full only because I need to stop messing with it and do other things
Sent from my HTC One X using Tapatalk 2
I charged mine for 4 hours before use.
Although it is probably not necessary nowadays, I like to fully discharge the device, then charge it overnight (so it gets back up to 100% and tops off), then cycle it that way 2/3 times, so properly "condition" the battery, as I don't 100% trust the conditioning done before shipping.
Just as a side note, most of the battery conditioning lore is coming from way back in the bad ol' nicad days (probably 1990's), when you HAD to 100% discharge/recharge the battery, and make sure it didn't overcharge or undercharge, else it would not be "conditioned" properly, and it had a permanently reduced max charge. Nowadays, expecially with Lion, it is not necessary, and may even be harmful to fully discharge/recharge cycle EVERY time you use it. The first few times it's probably best to do it to fully condition the battery, but beyond that, it really does nothing.
hanthesolo said:
Although it is probably not necessary nowadays, I like to fully discharge the device, then charge it overnight (so it gets back up to 100% and tops off), then cycle it that way 2/3 times, so properly "condition" the battery, as I don't 100% trust the conditioning done before shipping.
Just as a side note, most of the battery conditioning lore is coming from way back in the bad ol' nicad days (probably 1990's), when you HAD to 100% discharge/recharge the battery, and make sure it didn't overcharge or undercharge, else it would not be "conditioned" properly, and it had a permanently reduced max charge. Nowadays, expecially with Lion, it is not necessary, and may even be harmful to fully discharge/recharge cycle EVERY time you use it. The first few times it's probably best to do it to fully condition the battery, but beyond that, it really does nothing.
Click to expand...
Click to collapse
"Conditioning" does not occur with li-on batteries, period. Charging/discharging does absolutely nothing for the life of your battery.
Ifixit shows that the battery inside the Nexus 7 is Lithium Polymer. Does that make a difference in terms of conditioning compared to Li-Ion batteries?
MaxCarnage said:
"Conditioning" does not occur with li-on batteries, period. Charging/discharging does absolutely nothing for the life of your battery.
Click to expand...
Click to collapse
Oh, thanks. I thought that was my being paranoid .
Lithium Polymer batteries are actually worse than Lithium-Ion. Don't take my word for it, but at least with older RC Lipo batteries, fully discharging damages them even more the lithium-ion. I am sure the tablet cuts off way before the danger point, but still something to keep in mind.
Here's the deal- and this has been verified on multiple devices with larger batteries- Your tablet will need to self-calibrate the battery meter/charging to the battery. You can expect things like sketchy battery life and running down very low or completely overnight for the first couple days. Once everything "syncs up", you can take advantage of the full potential of the battery. This happened with my Razr Maxx and it happened on my Nexus 7's first overnight. And, talking to people who have had their Nexus 7's a few days, it's common and expected.
As said, it is NOT the battery conditioning, it is the device calibrating. The battery is pretty big and there's a period of time while the device learns.
I decided to drain the battery all the way and then charge it all the way up. It's charging right now actually, any idea how long it should take to get up to 100%?
Sent from my SAMSUNG-SGH-I777 using xda app-developers app
phoneman09 said:
I decided to drain the battery all the way and then charge it all the way up. It's charging right now actually, any idea how long it should take to get up to 100%?
Sent from my SAMSUNG-SGH-I777 using xda app-developers app
Click to expand...
Click to collapse
Not sure but you can always tap the power button to pull up the battery charge animation. It should let you know when it is fully charged.
Sent from my Nexus 7 using Tapatalk 2
Over discharging a Lithium Ion battery can ruin it in a single cycle. Of course any consumer device should shut off before that happens but deep discharges to the shut off point still permanently reduce battery capacity significantly more than shallower discharge cycles.
In simple terms, you'll get significantly more hours of battery use during its lifetime if you only discharge to 50% than 10% or less.
Lithium Ion batteries never need to be "fully discharged" to the device shut off point and as stated above, it isn't "good" for them.
That said, a discharge from fully charged to at or near shutoff let's the device software measure the battery capacity more accurately so you'll get a more accurate battery reading.
Lithium Ion batteries should not be charged at elevated temperatures. If you just watched a two hour movie, let it cool down before charging. A tablet is a nasty place for a battery with the CPU heating it up. Most manufacturers advise not charging at > 85 deg F and 70 deg F is better. A really good charger will measure battery temperature and reduce the max charging rate at elevated temperatures.
Lithium Ion batteries should be stored at 50-70% capacity and not fully charged. That's ~3.7 V per cell. Those of us who use the device a lot on external power would see a lot longer battery life if there was a mode which allowed keeping the battery below 100% while on external power. It seems every manufacturer thinks consumers are too dumb to understand the value of providing it and switching to full charge mode before we run off on battery power.
TP_NC_USER said:
Over discharging a Lithium Ion battery can ruin it in a single cycle. Of course any consumer device should shut off before that happens but deep discharges to the shut off point still permanently reduce battery capacity significantly more than shallower discharge cycles.
In simple terms, you'll get significantly more hours of battery use during its lifetime if you only discharge to 50% than 10% or less.
Lithium Ion batteries never need to be "fully discharged" to the device shut off point and as stated above, it isn't "good" for them.
That said, a discharge from fully charged to at or near shutoff let's the device software measure the battery capacity more accurately so you'll get a more accurate battery reading.
Lithium Ion batteries should not be charged at elevated temperatures. If you just watched a two hour movie, let it cool down before charging. A tablet is a nasty place for a battery with the CPU heating it up. Most manufacturers advise not charging at > 85 deg F and 70 deg F is better. A really good charger will measure battery temperature and reduce the max charging rate at elevated temperatures.
Lithium Ion batteries should be stored at 50-70% capacity and not fully charged. That's ~3.7 V per cell. Those of us who use the device a lot on external power would see a lot longer battery life if there was a mode which allowed keeping the battery below 100% while on external power. It seems every manufacturer thinks consumers are too dumb to understand the value of providing it and switching to full charge mode before we run off on battery power.
Click to expand...
Click to collapse
I would rather always have my battery near max charge when I take it off the charger than have a battery last 7 years instead of 3 or 4 in a device I will realistically only use extensively for 2. Even more so with a phone where they battery can replaced for $20. I'll take a full charge every time over the battery lasting for years longer than I need it to.
I have a first gen iPod Touch I bought when they were released (2007 I think?). I have left it on a charger for MONTHS. Still holds a decent charge.
Is there benefit to using a battery calibration app like this if you're rooted?
https://play.google.com/store/apps/details?id=com.nema.batterycalibration&hl=en
You don't have to but I like to. Mine was like 40% charged when I unboxed
Sent from my Nexus 7 using xda app-developers app
sRDennyCrane said:
Here's the deal- and this has been verified on multiple devices with larger batteries- Your tablet will need to self-calibrate the battery meter/charging to the battery. You can expect things like sketchy battery life and running down very low or completely overnight for the first couple days. Once everything "syncs up", you can take advantage of the full potential of the battery. This happened with my Razr Maxx and it happened on my Nexus 7's first overnight. And, talking to people who have had their Nexus 7's a few days, it's common and expected.
As said, it is NOT the battery conditioning, it is the device calibrating. The battery is pretty big and there's a period of time while the device learns.
Click to expand...
Click to collapse
Calibration occurs every time the battery is charged to 100%. It isn't a "first few days" type of thing, it is every single time the battery meter reaches 100%.
I had no choice but to completely charge my N7 (purchased from Office Depot 7/14). When I went to turn it on the first time, I was greeted with small text in the upper left side of the screen that said "show low battery logo" on a completely black screen. No logo...no nothing. Completely blank. Plugged it in, the battery charging logo popped up, fully charged it and it's been working great since.
However, I found it a bit odd as I thought most of these types of devices ship with about a 40% battery charge.
Thoughts?
I charge my phone overnight, from around 10PM to 8AM, then I leave my phone charging in its dock from about 9AM to 5PM during the work day...
any harm in doing this? I'd like my phone to last quite a while, as we are currently in a serious relationship, and I don't plan on letting her go....
What hurts your phone battery is not charging it but keeping it on high temperatures for a long time. And guess what keeps it on high temperatures: yep, you guessed it, charging for a long time.
Sent from my HTC Desire C using xda app-developers app
While it always depends on the charging circuit, keeping your battery topped up by constant charging (even trickle maintenance) will reduce the voltage level that it can be charged to. This will take quite some time to notice, and several deeper charging cycles will "repair" this to a certain extent. But with any battery, keeping it any constant level will reduce its charging capacity, and continual charging (trickle or otherwise) will "cook" the batteries chemical make up sooner.
To do what you're doing everyday will absolutely have an impact on your battery's health over the long term. But to exactly what extent is based on several factors I don't have specific data on.
Absolutely, our phone battery is designed for mobile usage, not to be tethered to a charger constantly. Constant charging is unnecessary, wasteful and leads to early battery demise.
Sent from my Nexus 7 using xda premium
And aren't our high end modern phones also designed to trickle charge when it gets to %100, so no harm can come to it?
caliber177 said:
And aren't our high end modern phones also designed to trickle charge when it gets to %100, so no harm can come to it?
Click to expand...
Click to collapse
I suppose it depends on how you define "harm". Read my post above again. Any level of current that is continually supplied to a charged battery will accelerate the aging of it.
Even if the charger were to shut off completely, and then resume charging at a certain level (which I believe is the behavior of the LG wireless charger at 95%), continually discharging and recharging from 95% to 100% is probably not ideal.
But all of this is probably not all that great of an affect in the grand scheme of things. You're not gonna kill your battery in a matter of months by leaving on the charger all of the time. Yes you will accelerate the degradation of the battery's health over time, but if your phone is in use enough so the battery is being discharged regularly between charges, I doubt that you will notice it for a long time, if at all.
I can say that if you simply leave it charging 24/7 without any other kind of use you will be able to measure degradation surprisingly soon. As to how noticeable it will be is very hard to say.
I use and suggest Battery Monitor Widget from 3c. It takes the guess work out of what you see when you're charging and what happens to the phone when it reaches 100%.
As the phone gradually reaches 90%, charging is noticeably slowed. From about 92-100% it trickle charges from around 300 to 200 to 100mA until it reaches 100%. Charger stops charging when full and lets the battery level drop slightly before charging it back to 100%. You're constantly topping it off at full and batteries of this chemistry don't like that.
As far as I can recall, these types of batteries actually thrive on being run down and cycled back up. The only catch is, don't run them down until it's completely dead. You've significantly cut the life of your battery if you do it quite often.
To answer your question, it probably doesn't hurt that much. If you do it for months, maybe years. Yeah, you'll see some degradation.
desynch- said:
As far as I can recall, these types of batteries actually thrive on being run down and cycled back up.
Click to expand...
Click to collapse
I would correct this and say the battery loves being near the median. Store at 40% battery! 100%-0% is bad... 100%-10% is better, 90/10 is better etc...
80/40 is really good for preserving charge cycles. Basically, charging at 30% back up to 70% is better than letting it go down to 0%
Note: this is a REALLY good battery in this phone. Just USE it until you feel it's dying too soon and buy a new one. Batteries are cheap and will be cheaper in 2-3 years.
But we can't buy battery for this phone.. I always let it run down to 14% that's when the warning message pops up.. Then back up, charges in 2 1/2 hrs then I leave it on an hour more until I leave from work so I could have a full phone.. Note, I work over nights, so its dead at around 2 or 3 am sometimes, then I leave at 6 am..
Sent from my Nexus 4
Please... I would say we can in a few months! Most of us have already voided the warranty
Sent from my Nexus 4 using xda premium
Most of us in here don't keep our phones long enough to notice any battery degradation..
Just charge it as often as you can but unplug it when it's full.
To be safe I would let the phone idle off of the work charger and only plug in at home.
dralways said:
To be safe I would let the phone idle off of the work charger and only plug in at home.
Click to expand...
Click to collapse
Agreed, I only charge once a day and it's usually sufficient, if your a heavy user and are concerned about the phone dying at night, let the phone decharge normally throughout the day and plug it in an hour or an hour and a half before you leave, however long it takes to charge the device after a workday's worth of usage (Whatever that is for you)
I do this myself if I'm using my phone heavily during the day and know I'll be out all night. Like some said you'll probably never even notice the degradation, but when you know it's not good for the battery in the strictest sense why risk it, the phones aren't designed to be charging 2/3rd of the time, they are designed to be charged and then taken off the charger and used.