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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..
Prior to getting the Galaxy S, after I read what Samsung were saying in the manual of not to overcharge, I investigated the reasons and wrote in various topics on the battery and the differences between Li-Ion & Li-Pol battery types.
At that point with all the evidence found it made sense to believe that what Samsung were saying in not to overcharge was accurate.
Basically, at that time it was believed the phone used a Li-Pol, Li-Pol batteries are different in that they are 'wet cell' as opposed to Li-Ion which are 'dry cell' charged.
Li-Pol can be manufactured much thinner but can not be manufactured in different shapes.
This is to allow the wet cells whilst under charge which become hot to move around the battery freely. If a Li-Pol was manufactured in different shapes like Li-Ion it would create a 'hot-spot' in an area where the wet cell could not move fluidly around the remainder of the battery.
However, it has now come to light that this is not the case and that the batteries provided with the phone are indeed Li-Ion.
Anyway, moving on to the present.......
After now getting the phone and doing a bit of testing I have found the overcharging issue NOT to be an issue.
When you commence a charge on the phone the icon changes to a charge state.
However, once the battery has reached maximum charge capacity the battery icon automatically changes to a 'Non-Charge' state and then the phone simply runs off it's own battery. This is despite the phone is still connected to the charger.... It's just that the charger although still attached is no longer charging the battery.
As soon as the battery falls below a certain figure (I've had different figures ranging from 98% right down to 91% which is probably due to whatever the phone is doing at that particular time to wake the phone up from realizing "hey, you are still attached to a charger, now wake up and start charging again").
So to all of us who have been worried about overcharging, my personal advise is to NOT worry and charge as and when you feel the need.
Hope this helps.
Beards
Thanks for clear up, I was always been scared while charging that it may blow up.
Nice find!
However, it has now come to light that this is not the case and that the batteries provided with the phone are indeed Li-Ion.
Click to expand...
Click to collapse
When you say "it has come to light", what do you mean? Is it just your deduction from your battery tests, or did you see this info from Samsung?
From what I understood, the LI-Pol overcharging is an issue in theory, but in real life applications its not a problem as long as you use the charger that is designed with LiPol in mind, it will auto shutoff charging once it senses the battery is full.
I have just charged mine from bone empty to full. A notification came up stating that the battery was full and to disconnect the charger. Although the battery monitor app says it is not charging and the normal battery meter has gone solid.
I agree that it seems to stop the charging circuit. Although I thought we were getting LiPo not li ion for these as well it's definitely li ion though.
Morbo66 said:
When you say "it has come to light", what do you mean? Is it just your deduction from your battery tests, or did you see this info from Samsung?
From what I understood, the LI-Pol overcharging is an issue in theory, but in real life applications its not a problem as long as you use the charger that is designed with LiPol in mind, it will auto shutoff charging once it senses the battery is full.
Click to expand...
Click to collapse
Take the battery out and turn it over. Now read the battery type and you will see it says Li-Ion.
if such, it will reduce the re-charge cycle....
i suggest, power off the phone and then keep charge overnight will be safe....
otherwise, if it is on and charges only full then disconnect it
hkfriends said:
if such, it will reduce the re-charge cycle....
i suggest, power off the phone and then keep charge overnight will be safe....
otherwise, if it is on and charges only full then disconnect it
Click to expand...
Click to collapse
Modern battery's don't have cycles where you loose power by continuously topping up the battery.
The practice I use is I charge whenever I get the chance, then after around 30 charges I run it right down and do a full charge.
As to powering off the phone to charge, this is not always convenient.
I need my phone on all the time in case I get an emergency call-out and I'm sure there are others who need their phones on overnight to use as a morning alarm.
Finally, I'm not sure if the practice you mention in powering off the phone and charging overnight would have the same effect in being able to re-charge when the battery level drops.
I think doing it in your method the charger would continuously hit the battery regardless as to whether or not it is fully charged ~ which in effect is what Samsung are saying in not to overcharge.
Beards said:
...once the battery has reached maximum charge capacity the battery icon automatically changes to a 'Non-Charge' state and then the phone simply runs off it's own battery. This is despite the phone is still connected to the charger.... It's just that the charger although still attached is no longer charging the battery.
As soon as the battery falls below a certain figure (I've had different figures ranging from 98% right down to 91% which is probably due to whatever the phone is doing at that particular time to wake the phone up from realizing "hey, you are still attached to a charger, now wake up and start charging again").
Click to expand...
Click to collapse
To me it seems like the phone will NOT use the battery as long as it is plugged in. On my phone the battery meter never drops under 100 % when connected.
Beards said:
Modern battery's don't have cycles where you loose power by continuously topping up the battery.
The practice I use is I charge whenever I get the chance, then after around 30 charges I run it right down and do a full charge.
As to powering off the phone to charge, this is not always convenient.
I need my phone on all the time in case I get an emergency call-out and I'm sure there are others who need their phones on overnight to use as a morning alarm.
Finally, I'm not sure if the practice you mention in powering off the phone and charging overnight would have the same effect in being able to re-charge when the battery level drops.
I think doing it in your method the charger would continuously hit the battery regardless as to whether or not it is fully charged ~ which in effect is what Samsung are saying in not to overcharge.
Click to expand...
Click to collapse
AFAIK, the reason to fully deplete the battery is to properly calibrate the % remaining in your battery. Running your battery down to empty causes more stress to the phone than running it down 50%. I happened to get a free battery with my device, but I would've bought a spare if I didn't get a free one, so I can easily go 3-5 days depending on usage, during this time I have my house and work to do charges. However, let's say I were to be expecting to have less frequent charges, such as taking a vacation, prior to that I would be fully depleting the battery to 0% to calibrate because then the battery level is more important to me. The trade off of long-term life vs short term accuracy is a very easy decision for me to make due to my situation.
In older batteries you had to "use the cells or lose them" situation where it was better, to at least occasionally, completely run down the device rather than doing partial cycles. These days, charging @ 50% 2 times is equivalent to 1 cycle of 100% with less long-term "stress" to the battery.
borchgrevink said:
To me it seems like the phone will NOT use the battery as long as it is plugged in. On my phone the battery meter never drops under 100 % when connected.
Click to expand...
Click to collapse
Same for me.
The reason it tells you to unplug the charger when done charging has nothing to do with battery. It is to save power. Battery chargers still draw some power just because they are plugged in. And in these green times it is ofcourse very popular to have warnings everywhere so you can claim to a green company. And every lithium ion and polymer battery contains electronics designed to protect them from abuse. Including over charging. So that will never be a problem on any phone unless you have a defective battery.
Is there a way to disable the message telling you to unplug the charger? I charge my phone overnight and use it as a clock, but when I wake up in the morning and try to see the time there's this huge popup in the middle of the screen telling me my battery has charged.
Joans said:
Is there a way to disable the message telling you to unplug the charger? I charge my phone overnight and use it as a clock, but when I wake up in the morning and try to see the time there's this huge popup in the middle of the screen telling me my battery has charged.
Click to expand...
Click to collapse
I think I read that the newest, or maybe just a random middle since something has superseded it, firmware fixed this.
interesting topic thx Beards for sharing your insights.
Overcharging - read the manual
Guys, if you will read the manual that came with your SGS, it says there that "DO NOT OVERCHARGE YOUR BATTERY FOR MORE THAN TWO WEEKS". It obviously means that the battery can be overcharged for more than a day as long as it is not more than 2 weeks ( I doubt if someone will be able to do that). So that confirms also that we can recharge anytime and not necessarily have it done to zero before charging. Hope this helps also
i've pretty much quit worrying about the overcharge after the first month of usage
i was following the auto pop up message, just because i wanted to conserve battery
but having 3 spare battery made me though it's futile
and it was extreme annoying to wakeup in the middle of the night, just to unplug it
it was awesome the day i found that patch on the forum to disable the annoying pop up alert that your battery is full.
now i can sleep the whole night without the alert coming online, and rest at ease knowing if the phone actually alerts me, it'll be a phone call or something important, not some annoying "unplug me plz!" message
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.
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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.
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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?
Please discuss everything related to battery or charging in this thread
Great! So I got myself thinking about the dock charging situation: Why is it so that the dock charges the pad instead of the pad drains the dock?
In my opinion it is better (or more logical) that the pad sees the dock as rendundary battery and drains it at need. F.e. the pad runs till 50% then drains the dock completely dry and then uses the rest of its 50%.
Btw: I wonder if the dock charging logic is realized with hardware or software by Asus...
UncleManuel said:
Great! So I got myself thinking about the dock charging situation: Why is it so that the dock charges the pad instead of the pad drains the dock?
In my opinion it is better (or more logical) that the pad sees the dock as rendundary battery and drains it at need. F.e. the pad runs till 50% then drains the dock completely dry and then uses the rest of its 50%.
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Um, at the end of either scenario, aren't you left with the same overall usage time and 2 dead batteries?
And isn't your preferred scenario almost exactly what happens in real world use?
what widgets drain battery?
i know widgets like weather, email, news drain battery because they need to update, use internet connection, so i don't use them to save battery.
but what about "offline" widgets like google play music, clock,... do they drain battery too? they don't update information using internet, but they do update "offlinely" - i mean, for example: google play music, now it shows the song "A", then you open the app and skip to song "B", when you go back to homescreen the widget will show song "B". so it has to update, does this drain the battery?
lol i guess i worry about battery too much, and just figured out that i created the thread "should i use battery saver app", i should have post it in this thread, sorry
and does leaving the charger plugged in to the wall outlet when not charging the tablet harm the charger or waste electricity?
nooktablet said:
and does leaving the charger plugged in to the wall outlet when not charging the tablet harm the charger or waste electricity?
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CHARGING/DISCHARGING TIP:
LET THE DEVICE (THIS GOES FOR ANYTHING WITH A RECHARGABLE BATTERY) FULLY CHARGE.
UNPLUG, THEN LET IT FULLY DISCHARGE...ALL THE WAY!-- JUST LET IT DIE WHERE IT WONT TURN ON.
Doing this will increase battery time, decrease battery wear/tear, possible damage done by overcharging.
Do this on a regular basis, and youll start to see it will last longer then 10hrs
Because of this, i run alot of widgets, on performance mode, i have around an extra 30MIN, so 10hrs 30min is my batterys life.
*leaving the device plugged in,charging when its full, is bad!
*using the device, while charging, burns up the battery, youll notice it getting hot.
Picked this tablet up the other day. I noticed that when I took it in the car and plugged it's charging cable into my car usb charger (kengsington powerbolt) that it did not show that it was charging. Is this common? The charge has worked for all the phones I've plugged into it.
CyberdyneSystems said:
CHARGING/DISCHARGING TIP:
LET THE DEVICE (THIS GOES FOR ANYTHING WITH A RECHARGABLE BATTERY) FULLY CHARGE.
UNPLUG, THEN LET IT FULLY DISCHARGE...ALL THE WAY!-- JUST LET IT DIE WHERE IT WONT TURN ON.
Doing this will increase battery time, decrease battery wear/tear, possible damage done by overcharging.
Do this on a regular basis, and youll start to see it will last longer then 10hrs
Because of this, i run alot of widgets, on performance mode, i have around an extra 30MIN, so 10hrs 30min is my batterys life.
*leaving the device plugged in,charging when its full, is bad!
*using the device, while charging, burns up the battery, youll notice it getting hot.
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I believe you are mostly right, but letting the battery constantly drain and recharging from 0-10% makes it work really hard and it makes in turn the life of the battery less. But in terms of life we are talking about a couple of mins less every half a year or so, since these devices get replaced by new ones every 1-2 years I guess it is ok.
If you want to sustain the most battery life just charge it from time to time when it gets lower than 40%. If you are having problems with battery duration, charge to 100% let it discharge completely then charge again until 100% without interruption. I do the full discharge and charge every month or so.
CyberdyneSystems said:
CHARGING/DISCHARGING TIP:
LET THE DEVICE (THIS GOES FOR ANYTHING WITH A RECHARGABLE BATTERY) FULLY CHARGE.
UNPLUG, THEN LET IT FULLY DISCHARGE...ALL THE WAY!-- JUST LET IT DIE WHERE IT WONT TURN ON.
Doing this will increase battery time, decrease battery wear/tear, possible damage done by overcharging.
Do this on a regular basis, and youll start to see it will last longer then 10hrs
Because of this, i run alot of widgets, on performance mode, i have around an extra 30MIN, so 10hrs 30min is my batterys life.
*leaving the device plugged in,charging when its full, is bad!
*using the device, while charging, burns up the battery, youll notice it getting hot.
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Click to collapse
i heard many people say letting it fully discharge (use until it turns off) and charge back to 100% will harm the battery, (or battery's lifespan). i read many guides online and all of them say this. i asked other people in other forums and they said the same thing.
but i guess you're right that it will improve battery life, in about a half year or a year (depending on how often you charge), then the battery won't be able to hold a long charge anymore. it won't be a problem it you plan to change/upgrade your device next year anyway.
The best battery tips that I use
Remove unnecessary widgets
Use a clean rom
Set your CPU to ondemand and put it on lowest frequency
Turn of wifi when you are not using your device
If you don't need your device for longer than an hour, turn it off
I use it for about an hour during the mornings up until dinner, then it gets a workout and I have never had my tablet die on me, or a need to rush for a charger.
So what are your battery habits with the 6p? Do you plug it in at night and take it off in the morning? Or do you charge it when it drops dead? Or little charging cycles throughout the day?
I have been charging it when it's low. Not leaving it plugged in all night :angel:
I charge my 6P the following day if I seldom use it. Otherwise I charge it sometime before I go to bed. Usually at that time I'm on PC. Interestingly I haven't charged the 6P while I'm sleeping. Doze works rather well.
I haven't run into a time where the phone died during the day, but I'm not a heavy user by any means.
sliyk said:
So what are your battery habits with the 6p? Do you plug it in at night and take it off in the morning? Or do you charge it when it drops dead? Or little charging cycles throughout the day?
I have been charging it when it's low. Not leaving it plugged in all night :angel:
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You're doing the right thing by not keeping it plugged in overnight, keeping a lithium battery at peak voltage like that will degrade the long term life onf the battery. Definitely shoulnd't let it "drop dead" either, that's another no-no for lithium batteries. I ususally give it a good charge in the evening before I go to bed, and then a couple of little top up charges during the day if they're needed. You might find these articles interesting:
http://batteryuniversity.com/learn/article/do_and_dont_battery_table
http://batteryuniversity.com/learn/article/how_to_prolong_lithium_based_batteries
I plug my phone in every night and leave it plugged in until the next morning. I've never had any noticeable issues with my phones by doing that.
Acoriano said:
I plug my phone in every night and leave it plugged in until the next morning. I've never had any noticeable issues with my phones by doing that.
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Whether you notice it or not, it is degrading your long term battery life. This is a scientifically tested fact.
Whenever my battery is low I just plug it in. The type c charger is great with very fast. I never leave it on charge over night.
I just charge it when needed or convenient, never over night.
I always charged my Nexus 4 overnight, but with 2% battery loss overnight for the Nexus 6P due to Doze and the quicker charging speed I decided to take care of my battery this time and just charge it in the evening or in the morning while getting ready for work.
Like most here, charge it when it's 20% at the end of 24 hours more or less. Charge till full, Unplug, go to sleep. Doze is good for me too.
Sent from my Nexus 6P using Tapatalk
I charge it before going to sleep and let doze do the work. And now I plug it in the car and at work too so minimum cycles are used.