This is particularly true for those who are un-rooted and on Stock where wiping battery stats is not available.
I bought my N4 on 1st of Feb, and the first two charge cycles, when the phone powered off due to the OS reporting the battery at 0%, I was unable to power it back on. This is great, as the phone battery is truly empty!
Some charge cycles later, my phone would power off due to the OS reporting 0% - however, I would feel as though the battery didn't last as long as I was used to.
So to make sure the battery is truly dead... I boot into fastboot mode by pressing Volume Down and Power on straight after it shut itself down. The phone stayed on for a further 27mins, bearing in mind that in this mode, the screen is on full brightness and always on. 27mins of screen on time for a phone that manages only about 4hrs of screen on time at best, is a considerable amount of left over juice in the battery that the OS is missing out on.
Normally to correct this, we charge up to 100% and wipe battery stats in CWM.
[GUIDE]
I have found that to leave the phone on in fastboot mode until it drains the battery out completely, plug in your charger, then boot into Android, would show the battery at 0% - this is a TRUE 0%... charge it all the way up to 100% and you should have back your full battery performance. Don't forget to allow the 99% - 100% time. This is very important - It will make it to 100% eventually, be patient.
This is all based on my assumptions/guestimates/theory - please do comment and correct if you are the wiser. [though for now, it works flawlessly]
OT - This does highlight a flaw in the OS however, it's a problem with all Android devices, will they ever fix it?
You're just calibrating the battery. I'm sure most of us already let it die without needing t enter fast boot.
Sent from my Nexus 4 using Tapatalk 2
scream4cheese said:
You're just calibrating the battery. I'm sure most of us already let it die without needing t enter fast boot.
Sent from my Nexus 4 using Tapatalk 2
Click to expand...
Click to collapse
Also, you should not drain it to such an extent. If a battery ever reaches true zero, it won't turn on again or charge. The phone turns off (says zero) around an actual 5% because they don't want you to destroy your battery
Sent from my Nexus 4 using xda premium
Censura_Umbra said:
Also, you should not drain it to such an extent. If a battery ever reaches true zero, it won't turn on again or charge. The phone turns off (says zero) around an actual 5% because they don't want you to destroy your battery
Sent from my Nexus 4 using xda premium
Click to expand...
Click to collapse
Exactly.
Sent from my Nexus 4 using Tapatalk 2
Censura_Umbra said:
Also, you should not drain it to such an extent. If a battery ever reaches true zero, it won't turn on again or charge. The phone turns off (says zero) around an actual 5% because they don't want you to destroy your battery
Sent from my Nexus 4 using xda premium
Click to expand...
Click to collapse
These are Li-Po batteries
scream4cheese said:
You're just calibrating the battery. I'm sure most of us already let it die without needing t enter fast boot.
Sent from my Nexus 4 using Tapatalk 2
Click to expand...
Click to collapse
I guess I wasnt clear or there was a misunderstanding... I let it die, reaches 0% and starts to power off, I then boot it into fast boot mode, and find the battery with at least another 30mins of screen on time. This extra battery is what I'm trying to calibrate back into the OS stats.
Censura_Umbra said:
Also, you should not drain it to such an extent. If a battery ever reaches true zero, it won't turn on again or charge. The phone turns off (says zero) around an actual 5% because they don't want you to destroy your battery
Sent from my Nexus 4 using xda premium
Click to expand...
Click to collapse
Good observation, always worthwhile hearing other opinions. I would say though, that 30mins of screen on time would be more than 5%.
I'm in my experience, the phone was fully dead after leaving it on in fastboot mode, battery all out. Then I plugged it into the charger, I got a flashing red light, and then the battery charge icon appeared. I then booted up and the OS reported a true 0%. This charge cycle, since I did this I'm at 28hrs with 20% to go with everything on [Wifi etc]
But so far, it's been a great way to get the most out of the battery.... lets get some more opinions, good or bad..
All thoughts welcome!
The flaw in this argument is that wiping battery stats in recovery does absolutely nothing.
Sent from my Nexus 4 using Tapatalk 2
joshnichols189 said:
The flaw in this argument is that wiping battery stats in recovery does absolutely nothing.
Sent from my Nexus 4 using Tapatalk 2
Click to expand...
Click to collapse
If that really is the case, then surely that makes this approach even more convincing as something that "works" in maintaining good battery life!
Vyker said:
I guess I wasnt clear or there was a misunderstanding... I let it die, reaches 0% and starts to power off, I then boot it into fast boot mode, and find the battery with at least another 30mins of screen on time. This extra battery is what I'm trying to calibrate back into the OS stats.
Click to expand...
Click to collapse
You can't drain the battery fully when its on because the device has protection against draining the battery to a point which will damage it. In fast boot this control is not in place.
Is this worth doing? No. Our battery aren't replaceable and shortening its life to gain 5% is not worth it.
jhericurls said:
You can't drain the battery fully when its on because the device has protection against draining the battery to a point which will damage it. In fast boot this control is not in place.
Is this worth doing? No. Our battery aren't replaceable and shortening its life to gain 5% is not worth it.
Click to expand...
Click to collapse
I understand, good point, however we're not talking about just 5% here!
Explain how I was able to get an additional 30 mins screen on time!
Sent from my Nexus 4 using xda app-developers app
As skeptical as we can be, a lot of things can affect battery life so the extra 30mins could come from a number of factors.
On another note, I usually get 4-5 hours of screen time on my nexus 4.
Sent from my Nexus 4 using Tapatalk 2
Vyker said:
Explain how I was able to get an additional 30 mins screen on time!
Click to expand...
Click to collapse
Because it takes much less battery on fastboot mode? Radios don't need to be on , brightness is minimal, only 1 CPU runs at lowest frequency, flash memory is not powered on?
To have a logical argument here, we must know how long fully charged battery lasts under fastboot.
And in agreement with many other voices, I don't think draining battery obove manufacturer threshold is a brilliant idea.
Sent from my Nexus 4 in a Faraday cage
Related
Hi folks, I'm running CM6 8/26 nightly with Snap v7.4 kernel with SetCPU set to conservative on 998mhz max and 245mhz min. I'm getting horrid battery life and I think I'm doing something wrong: I wiped battery stats in Clockwork and now my battery SUCKS. -.-
Question is, what its the proper way of calibrating an Evo battery? I've seen the official HTC response but I don't think it's going to make a difference. Isn't there another method that requires you to drain the battery? Any info will be appreciated I've been looking at forums all day.
Sent from my PC36100 using XDA App
letshaveDEX said:
Hi folks, I'm running CM6 8/26 nightly with Snap v7.4 kernel with SetCPU set to conservative on 998mhz max and 245mhz min. I'm getting horrid battery life and I think I'm doing something wrong: I wiped battery stats in Clockwork and now my battery SUCKS. -.-
Question is, what its the proper way of calibrating an Evo battery? I've seen the official HTC response but I don't think it's going to make a difference. Isn't there another method that requires you to drain the battery? Any info will be appreciated I've been looking at forums all day.
Sent from my PC36100 using XDA App
Click to expand...
Click to collapse
You can't just wipe battery stats - there's a process to go through. What you're referring to is Cyanogen's battery recalibration method found here. Read through fully before wiping anything.
Thank u very much, I wiped the stats by mistake
Sent from my PC36100 using XDA App
fachadick said:
You can't just wipe battery stats - there's a process to go through. What you're referring to is Cyanogen's battery recalibration method found here. Read through fully before wiping anything.
Click to expand...
Click to collapse
Actually it is almost as simple as wiping battery stats. That command he gives is what the wipe battery stats command in the recoveries do.
1. Charge battery to full (where it's actually 100% not green light.
2. Boot into recovery wipe battery stats.
3. Fully boot into os then unplug charger.
4. Leave unplugged until the phone shuts itself off.
At that point you should be calibrated.
On a related topic, the Battery Graph app available in the market also has an option to wipe battery stats from within the OS, doesn't it? Might save having to reboot into recovery once you're charged up.
It's a lithium battery. You can't condition it. Just use it as normal and ignore all these placebo effect steps.
Sent from my PC36100 using XDA App
daving313 said:
It's a lithium battery. You can't condition it. Just use it as normal and ignore all these placebo effect steps.
Sent from my PC36100 using XDA App
Click to expand...
Click to collapse
This is all about calibrating the software (battery stats).
daving313 said:
It's a lithium battery. You can't condition it. Just use it as normal and ignore all these placebo effect steps.
Click to expand...
Click to collapse
They're not calibrating the battery. they're calibrating the phone to know when the battery is really fully charged which, until you do this, is not the case when the charge light turns green.
Regardless, none of this worked. I've quit all services, no sync, auto brightness and wifi and I'm still getting horrible battery life. SetCPU is set to conservative. It's BULL**** my display is on for thirty minutes and the battery dies 20%. I played a game on my friend's iPhone 4 for twenty minutes and his battery barely died 3%. This is really unacceptable and I'm probably going to return my Evo or sell it if the battery life doesn't get better soon from these methods I'm seeing online
Sent from my PC36100 using XDA App
Crazy man, maybe something happened cause that is pretty bad.
Have a backup to go back to, prior to this happening, to see if it reverts back to normal?
Naw nothing happened to my phone...... All of us Evo owners should be able to use this beautiful phone with all of the features at max without the battery going to ****. My phone has behaved this way since unboxing. I'm not a big fan of the iPhone 4 but I will give it props on battery life. I have yet to try the longer HTC method but it seems kind of pointless.....
Sent from my PC36100 using XDA App
If it has always been like that then you may have a bad battery, if it started after you wiped the battery data then it is just showing you bad readings.
You should be able to get a good calibration if you reset your battery data again, maybe try through your recovery if possible, and then fully charge it with your phone turned off. Once it is charged you can either use it normally till it dies or you can tether, use gps, watch youtube, etc, and drain the battery down. Just make sure you go from a full charge to the phone shutting itself off without plugging it in to anything. Do that charging with it off and using it till it dies two or three times and your battery stats will be calibrated.
When I did this to mine it showed my battery at 0% for at least half an hour before it finally died, and that was with me listening to pandora and browsing the web.
Edit: FYI, the Evo's talk time is usually between 6.5 to 7.5 hrs, the iPhone 4 is around 7 hours also. If your battery is not lasting that long you need to take it in to sprint and have them give you a new battery.
letshaveDEX said:
......I have yet to try the longer HTC method but it seems kind of pointless.....
Click to expand...
Click to collapse
HTC's method worked wonders for me. i'm a heavy heavy HEAVY user (no, not fat) and I get a good 10 hours with everything besides 4g on plus surfing, gaming and tethering for SEVERAL hours. For all that I do on my EVO 10 hours is HUGE. If I have a moderate day of usage (maybe a little more than moderate for the average user) I get around 19 hours.
Btw none of this will help if you are getting near 100% awake time. If that's the case you need to find the software causing that first.
Sent from my PC36100 using Tapatalk
Try this, it helped me. I did not come up with this btw.
With phone on, charge until green.
Unplug and turn phone completely off.
Charge phone until green once again.
Unplugand turn on. Once phone had turned completely on turn the phone back off again.
Charge until green one more time then unplug and turn on and you're done!
Sent from my Htc Evo 4g
I noticed something recently. My epic used to SUCK with battery life and took really long to charge. I've flashed a few roms over with ext4 etc, but I am now on stock dk28, (rooted+cwm2.5). Now what I noticed is that my battery charges really fast now even with wifi. BUT i m kinda thinking that maybe the battery statistics are not right? The batery seems to stay charged for a good time now too. Now, I am wondering why this could be. Three things I'm thinking:
1. I remember switching batteries with a vibrant before but I thought I switched them back. I don't know maybe I didn't now that I think about it?
2.flashing roms at random times/ when the battery was low. BUT I did odin back to stock 2.1 after all this..
3.Battery conditioning?
Thanks guys for any feedback.
Sent from my SPH-D700 using XDA App
What's really funny I just odined back today and I'm noticing really great battery life.
Sent from my SPH-D700 using XDA App
when u flash to a new rom that significantly different than the previous rom you had you need to get your phone fully charged, power off and wait for it to complete charging again then boot into clockwork,unplug,wipe batt stats, boot and dont plug in untill the batt dies and phone powers off. This will let android gauge your batt....i've notice that flashing a new rom with a low charge seems to really throw off the bat stats
BopChie said:
when u flash to a new rom that significantly different than the previous rom you had you need to get your phone fully charged, power off and wait for it to complete charging again then boot into clockwork,unplug,wipe batt stats, boot and dont plug in untill the batt dies and phone powers off. This will let android gauge your batt....i've notice that flashing a new rom with a low charge seems to really throw off the bat stats
Click to expand...
Click to collapse
That's not entirely accurate. Android gauges it on a full battery CYCLE. you don't have to go from full to dead. You should always start full though. You can run from full, to 50%, plug it in, back down to 50%. That would complete one full cycle. Theres a thread with all the info on it. I'd link it but I'm on my phone.
Sent from my SPH-D700 using XDA App
JBakey said:
That's not entirely accurate. Android gauges it on a full battery CYCLE. you don't have to go from full to dead. You should always start full though. You can run from full, to 50%, plug it in, back down to 50%. That would complete one full cycle. Theres a thread with all the info on it. I'd link it but I'm on my phone.
Sent from my SPH-D700 using XDA App
Click to expand...
Click to collapse
Gauges a full cycle, beeing the FULL cycle of the battery... i.e fully charged to fully drained... then it knows the capacity
That is all completely unnecessary. Just charge it to full, power off, boot into clockwork, wipe battery stats, restart. No other steps are required to calibrate your battery.
Or just simply use the phone normally and it will balance itself out naturally in a couple days. Charging is always quick for me "if" I'm not doing data and resource heavy tasks.
Sent from my SPH-D700 using Tapatalk
I do bump charging or quick charging or whatever its called.
The hero would charge to like 35% in 10minutes. The epic only charges to like 5% in 10minutes lol
I hate the epic battery. But when its fully charged, it lasts the day for me.
Sent from my SPH-D700 using XDA App
My epic battery used to be terrible, 4hours. But with little no changes im getting at least 12 hours or moderate use wifi, GPS, auto bright, and 3 or 4 widgets. i can only think that the battery has been conditioned.
Also i flashed the EB13 from here this morning with setCPU and i'm getting at least 4 more hours. Also charging is faster 30% in 60 minutes.
As of Saturday evening, my phone will no longer charge past 88%. Earlier on Saturday, the phone was charged to 100% in my car. We lost power and the phone ran down to 3% before I was able to charge it again.
After charging over 8 hours, the phone would not go past 88%. Any ideas?
MacAlert said:
As of Saturday evening, my phone will no longer charge past 88%. Earlier on Saturday, the phone was charged to 100% in my car. We lost power and the phone ran down to 3% before I was able to charge it again.
After charging over 8 hours, the phone would not go past 88%. Any ideas?
Click to expand...
Click to collapse
Have you tried to recalibrate the battery? Try this.
http://forum.xda-developers.com/showthread.php?p=16240746
Sent from my Atrix XDA Premium App
Voelker45 said:
Have you tried to recalibrate the battery? Try this.
http://forum.xda-developers.com/showthread.php?p=16240746
Sent from my Atrix XDA Premium App
Click to expand...
Click to collapse
I have not tried that. Weird thing is, the battery calibration app reads 4196mV at 70% while charging and ~4200 while at 88%.
Just go to CWM recovery and wipe battery stats. Do a few charge recharge cycle. It should be OK.
Sent from my MB860 using Tapatalk
anupash said:
Just go to CWM recovery and wipe battery stats. Do a few charge recharge cycle. It should be OK.
Sent from my MB860 using Tapatalk
Click to expand...
Click to collapse
Yup wiping the battery stats in cwm will do the trick
Sent from my MB860 using xda premium
Charge to 88% or until you notice it not going any further. Turn off the phone. Plug in the charger and wait until the battery display shows. While the phone is still plugged in, remove the battery. Wait for it to boot up and show a no battery icon (or something like that). Once it does, put the battery back in and leave it for about 30 mins. When you hit the volume buttons, the display will show between 5-10% charged. Anyway, after about 30 mins, turn the phone one and it should show 100%. Re-calibrate the battery after that using the app or recovery.
Are all android batteries like this? I've never had a device with such finicky battery stats. I too have the 88% problem and i feel like im recalibrating every week. I will try again.
s1mpd1ddy said:
Are all android batteries like this? I've never had a device with such finicky battery stats. I too have the 88% problem and i feel like im recalibrating every week. I will try again.
Click to expand...
Click to collapse
I don't think they're all like this..but I know its as annoying as F***. Every morning almost i'm doing the "battery pop out" trick just so that it'll read full. It would be different if it read 95% or something and stuck there for awhile until the battery caught up to the actual reading..but it doesn't. The battery continues to drain at a normal rate, so you basically lose however many % you had initially.
Definately annoying..
Rickroller said:
I don't think they're all like this..but I know its as annoying as F***. Every morning almost i'm doing the "battery pop out" trick just so that it'll read full. It would be different if it read 95% or something and stuck there for awhile until the battery caught up to the actual reading..but it doesn't. The battery continues to drain at a normal rate, so you basically lose however many % you had initially.
Definately annoying..
Click to expand...
Click to collapse
so you're having to do the pop-out trick every day? that's definitely not something you should have to do....... what gives with our battery?
Mine did this before and what I did was run it all the way to 0% and it cuts of and will not start, then charge it to 100% with the power off and and then boot it up. Work like a charm for me.
lilhaiti said:
Mine did this before and what I did was run it all the way to 0% and it cuts of and will not start, then charge it to 100% with the power off and and then boot it up. Work like a charm for me.
Click to expand...
Click to collapse
Same, friends atrix wouldn't get past 86%, calibration app didn't work and neither did wiping bat stats. Draining however did fix but damn was it slow. 6+ hours to reach 100%
Sent from my GT-I9100 using xda premium
ChongoDroid said:
Same, friends atrix wouldn't get past 86%, calibration app didn't work and neither did wiping bat stats. Draining however did fix but damn was it slow. 6+ hours to reach 100%
Sent from my GT-I9100 using xda premium
Click to expand...
Click to collapse
do you have the same battery issues on your galaxy?
So I've been sitting at 1% for the past hour. Been playing games, have wifi, bluetooth, GPS all turned on.
Thing will just not turn off!
EDIT: Right as soon as I post this, it turns off. Over 1 hour on 1%.
Will recharge tonight and hopefully it works right.
I had this problem for a while but you should know that it will fix itself eventually. The phone is fully capable of re-learning the limits of the battery and after several days will begin to display the correct charging status. Mine took about a week to start displaying 99% in the morning.
This happened after I did the complete discharge, charge, pull battery, charge again, then boot procedure. It was fine for a couple of days then started displaying 82% as a full charge then slowly got better. I'm fairly confident that I'm not leaving anything on the table in terms of capacity either since with moderate use and turning off wifi when I leave the house I'm getting about two days of charge.
Sounds like a jumping battery problem to me.
1. Click on this link: http://forum.xda-developers.com/showthread.php?t=1174349&highlight=battery+fix
2. Download juggernault's jumping battery fix.
3. Follow the instructions there
4. if it solves your problem, thank the dude for his contribution to the Atrix community and also leave him a comment to thank him.
heres what you need to do
http://www.youtube.com/watch?v=g2ehvLLmEIg
Already have juggernaults battery fix applied. Thinking this is just some freak occurrence.
EDIT: Drained the battery at work. Charged since 6:30 while powered off and phone charged past 88%. All is well in Atrixland!
MacAlert said:
Already have juggernaults battery fix applied. Thinking this is just some freak occurrence.
EDIT: Drained the battery at work. Charged since 6:30 while powered off and phone charged past 88%. All is well in Atrixland!
Click to expand...
Click to collapse
Not a freak occurrence. Happens to me too all the time.. makes me not wanna flash anything . I jump charged my phone to 100 today. Did battery pull, wiped stats and calibrated
Sent from my CM7 Atrix
s1mpd1ddy said:
do you have the same battery issues on your galaxy?
Click to expand...
Click to collapse
No none, I had battery drain but it was kernel related. I get a days worth of heavy usage out of mine now.
Sent from my GT-I9100 using xda premium
Figured I'd follow up. After doing all this ... first recharge went to 98. Second recharge overnight.. 85 Max. WTF
Sent from my CM7 Atrix
I normally leave my Nexus 7 plugged in and turned on when not in use. Is this bad for the battery? Should I be turning it off and leaving it unplugged, or off and plugged in instead? Thanks
Sent from my SAMSUNG-SGH-I727 using xda premium
I wouldn't worry, batteries are much better now and last much longer now when used like this.
By the time its an issue you'll be looking for a new tab or you can simply replace the battery, it's easy on the n7.
Sent from my Nexus 7 using xda premium
In my TF101 I charge it to 100%, then use it until android cries for power (around 15%) then charge again.
Sometimes I charge and use, other times I charge while off. Almost 2 years like this and battery life seems to be as good as when it was new.
I am doing the same thing on the N7.
Anyway, as dexter said, I think it's more easy nowadays than it was with NiMH / NiCd batteries. There are lots of recommendations, but surely most of them will render similar battery life.
I leave it on all the time, charge only when i am @ home or @ office when I notice it has dropped below 40-50%, no problems so far... If I turn it off, I wouldn't get notifications (even though I would on my phone)... but I kinda like to just take it whenever I like and not wait for it to boot...
I've read the more important factor is the opposite, don't let it drain down to 0%.
SDA_Lord said:
I've read the more important factor is the opposite, don't let it drain down to 0%.
Click to expand...
Click to collapse
This. Complete discharge is bad for the battery and can cause it to fail completely. As long as one doesn't constantly deplete their battery, it should last the life of the tablet.
Sent from my Nexus 7 using Tapatalk HD
Thanks all, good to hear.
Sent from my SAMSUNG-SGH-I727 using xda premium
So I have nexus 4 with battery that was bad it basically would die at 18% just shut off. So I replaced with new battery and I charged it right away to 100% and did battery calibration as soon as I unplugged it it said 79% every time then I plug it back it and it instantly counts and climbs back to 100% within min and once it hits 100% it fine it will drop normal I'm not sure if I shouldn't have done a battery calibration to brand new it like it remembering old battery now it does this every charge cycle it annoying.
Sent from my Nexus 4 using XDA Premium 4 mobile app
BiggTeddy26 said:
So I have nexus 4 with battery that was bad it basically would die at 18% just shut off. So I replaced with new battery and I charged it right away to 100% and did battery calibration as soon as I unplugged it it said 79% every time then I plug it back it and it instantly counts and climbs back to 100% within min and once it hits 100% it fine it will drop normal I'm not sure if I shouldn't have done a battery calibration to brand new it like it remembering old battery now it does this every charge cycle it annoying.
Sent from my Nexus 4 using XDA Premium 4 mobile app
Click to expand...
Click to collapse
There's absolutely no need to calibrate the N4's battery. You just don't need to.
What do I do now cause every time it shows 100% then drops to 79
Sent from my Nexus 4 using XDA Premium 4 mobile app
Better put back the original battery and try this:
1. Leave your phone to turn off cause of battery drain
2. Immediately reboot at fastboot mode and leave it alone for some time, till it gets off again. This is the real point 0 of battery.
Now charge it till 100% without using it.
After that use it normally and inform is if IT got any better.
Unleashed by my Nexus 4
So I bought new battery this new battery won't hold a charge past 79% so I ordered a new one I f!ash Stock and Relocked Boot loader now when I get new battery in it prob gonna be dead should I charge it til 100% and another 4-6 hours after to get beat life right ... Then run it once or twice till it complete dead and charge to 100%
Sent from my SM-T310 using XDA Premium 4 mobile app
Yes it helps. Thank you! :good:
RASTAVIPER said:
Better put back the original battery and try this:
1. Leave your phone to turn off cause of battery drain
2. Immediately reboot at fastboot mode and leave it alone for some time, till it gets off again. This is the real point 0 of battery.
Now charge it till 100% without using it.
After that use it normally and inform is if IT got any better.
Unleashed by my Nexus 4
Click to expand...
Click to collapse