Galaxy Nexus Battery Usage - Android OS - Samsung Galaxy Nexus

Hi
Not all the time but every so often my battery drains really quickly. It might be at 80% at night and at 20% the next morning and if I look at the battery usage stats the OS has used the majority of the OS. If I restart the phone it will usually be ok again.
Is there anyway of finding out what part of the OS is causing the issue or how can I stop it? Its not an issue if I am able to charge the device as soon as I relaise but sometimes I have to go out and then have a practically dead phone for the day. This can also happen at other times as well but I usually just check it periodically in case the OS is using the battery a lot.
Thanks
Brian

If you have CWM - charge the phone to 100%, then wipe the battery stats. Oddly enough, it did the trick for me. I've had about 20-25% overnight drain before. Now <5%.
Also check for apps that are waking your phone with BetterBatteryStats (you need to check for partial wakelocks). Maybe some app is not draining, but just wake your phone too often so it can't deep sleep.

if your android rooted,try "One Power Guard" download from onexuan.com,It can help you extend battery life .
Discuss from http://forum.xda-developers.com/showthread.php?t=1889740

tixed said:
If you have CWM - charge the phone to 100%, then wipe the battery stats. Oddly enough, it did the trick for me. I've had about 20-25% overnight drain before. Now <5%.
Also check for apps that are waking your phone with BetterBatteryStats (you need to check for partial wakelocks). Maybe some app is not draining, but just wake your phone too often so it can't deep sleep.
Click to expand...
Click to collapse
I can 100% guarantee that wiping battery stats in CWM had absolutely nothing to do with it. It is literally impossible, as batterystats.bin, which is the file being wiped, has zero bearing on the battery fuel gauge. Wiping battery stats has the exact same effect as, say for instance, charging the phone hanging upside down only on even-numbered dates. It also bears mentioning that the file is wiped by Android anyways when the phone is unplugged after charging,making the misguided advice to wipe it even more pointless.
Any "benefit" imagined by those who advocate wiping battery stats is a textbook example of the logical fallacy known as post hoc ergo propter hoc.
Sent from my Galaxy Nexus using Tapatalk 2

/\ post above is 100% correct. Wiping your battery stats will have absolutely no effect. It is not needed AT ALL.
Sent from my SGH-T999 using xda premium

Related

Quick Battery Drop in Initial 10%

Hi all,
I am puzzled by my problem. I am using Virtuous 2.7 + King's BFS kernel #4.
My phone battery will drop quickly from 100% to 92% right after unplugged from the power cord. By quickly, I meant I did not use the phone, killed all tasks, and battery will drop to 92% literally in minutes.
Bump charging, wiping battery stats, wiping dalvik cache, killing all tasks are not helping at all. I don't have SetCPU, but someone in the forum mentioned they have SetCPU, and it is not helping either.
Is anyone having this problem? Does anyone have any idea on how to solve this?
Please help.
Thank you!!!
chillmeow said:
Hi all,
I am puzzled by my problem. I am using Virtuous 2.7 + King's BFS kernel #4.
My phone battery will drop quickly from 100% to 92% right after unplugged from the power cord. By quickly, I meant I did not use the phone, killed all tasks, and battery will drop to 92% literally in minutes.
Bump charging, wiping battery stats, wiping dalvik cache, killing all tasks are not helping at all. I don't have SetCPU, but someone in the forum mentioned they have SetCPU, and it is not helping either.
Is anyone having this problem? Does anyone have any idea on how to solve this?
Please help.
Thank you!!!
Click to expand...
Click to collapse
I spoke to RMK as well as others about this in IRC, doesn't look like anything we can do, deep in the HTC code I guess.
I have the same issue using SkyRaider 3.1. Battery is 100% then after 5-10 minutes drops down to low 90s. It bothered me at first but after several days of moderate to heavy use and still having almost 50% battery left at the end of the day, I just figured it was some kind of bug when reading the battery level at the beginning. How is your battery life overall? If it's like mine, then i wouldn't worry too much about it as long as it's lasting longer. I'm using the 1750mAh battery from Sedio.
I was having the exact same problems until I went back to stock everything and bump charged. Took the OTA for 2.2, rooted, custom recovery, bump charged, wiped stats and cache and now I'm good to go. I usually dont think crap like this works but it made a huge difference in battery life and stopped the 100-90% problems I was having.
KB
I found this on EVO forum, but I don't know how his solution works. I personally don't think this would be the solution.
http://ip208-100-42-21.static.xda-developers.com/showthread.php?t=704272
I am using the 1500 mAh battery.
My battery life is uptime around 24 hours and awake time around 6-9 hours depending on usage.
so you're not having the issue anymore, after going back to stock (non rooted) with the official OTA 2.2?
KB Smoka said:
I was having the exact same problems until I went back to stock everything and bump charged. Took the OTA for 2.2, rooted, custom recovery, bump charged, wiped stats and cache and now I'm good to go. I usually dont think crap like this works but it made a huge difference in battery life and stopped the 100-90% problems I was having.
KB
Click to expand...
Click to collapse
KB Smoka, so you don't have this problem anymore?
Do you think format the phone and wipe all the data will help?
Have anyone tried formating the phone?
I've searched and found that the cause is the phone saying the battery is charged fully when its not basically so to fix this after it goes to 100% while the phone is one then u should turn it off and let it charge fully from there
Sent from my ADR6300 using XDA App
superchilpil said:
I've searched and found that the cause is the phone saying the battery is charged fully when its not basically so to fix this after it goes to 100% while the phone is one then u should turn it off and let it charge fully from there
Sent from my ADR6300 using XDA App
Click to expand...
Click to collapse
I did bump charge this phone, but it still drops like crazy.
I'll try this out tonight.
Thanks!
Is this a once time fix thing or do you have to do it every time you charge?
bump charging 4 or 5 times in a row (basically bump as many times as you need to to get it to where the light turns green withing a minute of 2 or plugging it in again) and then wiping battery stats solved this for me... kinda.. i still have to bump twice, but after that it'll stay at 100 for a good while and work it's way down normally, no jumping 10% down..
superchilpil said:
I've searched and found that the cause is the phone saying the battery is charged fully when its not basically so to fix this after it goes to 100% while the phone is one then u should turn it off and let it charge fully from there
Sent from my ADR6300 using XDA App
Click to expand...
Click to collapse
That is bump charging. Something htc is unable or unwilling to fix.
The issue has been known for a while and you have to 'bump charge' every time to avoid the 5-10% drop.
Here's their response about fixing the "bump charge".
"Dear **********,
I understand you would like to know if an update has be released to help get a full charge on your battery without having to bump charge it. At this time we have no information about any updates being released to help resolve this issue on your device. If an update is released for your device you will receive a notification on your device that an update is available.
To send a reply to this message or let me know I have successfully answered your question log in to our ContactUs site using your email address and your ticket number ************.
Sincerely,
Victor
HTC"
melophat said:
bump charging 4 or 5 times in a row (basically bump as many times as you need to to get it to where the light turns green withing a minute of 2 or plugging it in again) and then wiping battery stats solved this for me... kinda.. i still have to bump twice, but after that it'll stay at 100 for a good while and work it's way down normally, no jumping 10% down..
Click to expand...
Click to collapse
Do you bump charge every single time you charge right now? It's pain in the butt if I have to bump charge everyday.
Yup every day. 4 or 5 times is way overkill though. Just charge phone until green, turn off (don't need to unplug), wait until it turns green then do the plug/unplug one more time.
ufvj217 said:
so you're not having the issue anymore, after going back to stock (non rooted) with the official OTA 2.2?
Click to expand...
Click to collapse
Went to stock (official OTA), rooted, custom recovery, bump charged, reset stats and cache and I'm good now.
I charged it to "full" while it was powered on. Once the light turned green I turned the phone off, charged again until the light turned green. Took about 25 minutes. Powered up in recovery wiped battery and cache and now I'm good. The key is after doing all this you have to let the phone completely die.
If you're wiping your battery stats after a bump charge, you will have this problem every time you don't bump charge.
If you wipe your battery stats after it goes green without a bump charge, you won't have this problem.
This is because the software thinks the bump charged battery levels equal 100% charge. A bump charge adds approximately 10 percent of charge.
Formatting your phone or any software changes won't actually do anything other than wipe your battery stats while your phone is not at bump charge levels.
vantagejuan said:
If you're wiping your battery stats after a bump charge, you will have this problem every time you don't bump charge.
If you wipe your battery stats after it goes green without a bump charge, you won't have this problem.
This is because the software thinks the bump charged battery levels equal 100% charge. A bump charge adds approximately 10 percent of charge.
Formatting your phone or any software changes won't actually do anything other than wipe your battery stats while your phone is not at bump charge levels.
Click to expand...
Click to collapse
I'll try this instead! I don't want to bump charge everyday! It's too troublesome.
chillmeow said:
Hi all,
I am puzzled by my problem. I am using Virtuous 2.7 + King's BFS kernel #4.
My phone battery will drop quickly from 100% to 92% right after unplugged from the power cord. By quickly, I meant I did not use the phone, killed all tasks, and battery will drop to 92% literally in minutes.
Bump charging, wiping battery stats, wiping dalvik cache, killing all tasks are not helping at all. I don't have SetCPU, but someone in the forum mentioned they have SetCPU, and it is not helping either.
Is anyone having this problem? Does anyone have any idea on how to solve this?
Please help.
Thank you!!!
Click to expand...
Click to collapse
The reason this happens is because the battery gets charged fully to 100%, and then is allowed to slowly drain back to 90% (or so) before it's charged back to 100% again. This is how Lithium batteries are charged.
Try this: charge the battery to 100%, and immediately disconnect it after it's full. Notice how the battery doesn't drop to the low 90's immediately.
The reason "bump charging" appears to work is because there is no drain on the battery, since the phone is off. It goes to 100% and stops.
There's nothing we can do code-wise to fix this; it's just how the battery technology works. Keeping it fully charged at 100% while on would damage the charging capacity of our phones.
Btw.. wrong forum.
Solutions in search of a problem
Let me preface this by saying that I’m not an electrical engineer, or any sort of expert on phone hardware, but I think a couple issues are being confused. I’ve seen many posts about this battery “problem” here and elsewhere and an important point is being missed. People are confusing what the battery is actually doing with what the phone SAYS the battery is doing. They are NOT the same thing. The battery is a physical device and it will do what it’s going to do.
Battery life is a function of battery quality, initial state of charge, and demand. If you want the battery to last longer, look at ways of reducing demand. What applications are in use? How long is the screen on? What brightness level? Overclocking and undervolting settings? All these will affect ACTUAL battery life.
At lot of the “solutions” discussed have nothing to do with conserving energy use, but have everything to do with messing with how the phone REPORTS the state of charge. A good example is the issue of the initial drop reported by many users during the first few minutes after unplugging the charger. I see this on my own phone. If the phone is “taught” that 100% charge is when it is totally crammed with juice and plugged in as well, it’s not surprising that there is a good bit of voltage drop (+/- 10%?) right after unplugging. Does this mean there is a problem? NO! It’s just the battery doing what batteries do. A lot of the suggestions about wiping battery stats and such have nothing to do with saving energy. They are ways of fiddling with how the phone REPORTS its condition under various circumstances.
My advice: if you are happy with how your battery lasts, over the course of a day or so, then learn to relax, crack open a cold brew, and revel in just what a great phone the Incredible is. If your battery isn’t lasting as long as you need it to, then look at ways to save power or get a larger capacity battery. Tweaking the battery meter function is simply a feel-good exercise and won’t get you any actual improved performance. END OF RANT.
I can confirm that my gf's phone and my good buddies phone(both were never rooted) have never had a problem with the phone charging up slow first off(both phones charge about 1% per minute). And since they accepted the OTA, have not had the problem of charging to 100% and quickly jumping down to 90%. For instance, the other day my buddy charged his phone while on to 100%, played a game for about 2 minutes and closed it, battery was at 99%. Now I have tried and continually try every possible solution to my battery dying quick and charging slow, but am realizing that this must just be the cost of customizing my phone to my liking. And at least for the moment, a stock 2.2 DINC is just not an option for me.
larsrya8 said:
The reason this happens is because the battery gets charged fully to 100%, and then is allowed to slowly drain back to 90% (or so) before it's charged back to 100% again. This is how Lithium batteries are charged.
Try this: charge the battery to 100%, and immediately disconnect it after it's full. Notice how the battery doesn't drop to the low 90's immediately.
The reason "bump charging" appears to work is because there is no drain on the battery, since the phone is off. It goes to 100% and stops.
There's nothing we can do code-wise to fix this; it's just how the battery technology works. Keeping it fully charged at 100% while on would damage the charging capacity of our phones.
Btw.. wrong forum.
Click to expand...
Click to collapse
Sorry that I posted in the wrong forum. I thought this is related to the kernel or ROM I am using (Which is development right????).
Not to question your knowledge about the "battery technology", but why is it only happening to certain people? Nowadays most device are using Li-ion battery, why this phenomenon do not occur to all devices?

(Q) how do you calibrate the G2 battery?

Hey what's up. I got this G2 with the latest cm7, which is build number 21 and the battery life is horrible. Like 8 hours with an hour of the display being on. I'm coming from the Epic which had pretty good battery life once calibrated.
So what's the proper way of calibrating the G2? I am using the stock kernel that comes with the Cm7 rom right now but I did try the pershoot kernel couple times and underclocked it but it still didn't help. I think all that kernel flashing messed up my battery life. So any ideas? Thanks!
Sent from my HTC Vision using Tapatalk
saywhat4118 said:
Hey what's up. I got this G2 with the latest cm7, which is build number 21 and the battery life is horrible. Like 8 hours with an hour of the display being on. I'm coming from the Epic which had pretty good battery life once calibrated.
So what's the proper way of calibrating the G2? I am using the stock kernel that comes with the Cm7 rom right now but I did try the pershoot kernel couple times and underclocked it but it still didn't help. I think all that kernel flashing messed up my battery life. So any ideas? Thanks!
Sent from my HTC Vision using Tapatalk
Click to expand...
Click to collapse
Charge your phone all the way to 100% (not just until the LED turns green, which is around 90%), unplug and boot into recovery, wipe battery stats, boot back into Android and use your phone until the battery drains and your phone shuts off. Keep trying to power up until it won't any more.
Now, plug your phone in (into the wall, not a computer) and charge until full *without* turning it on. Remember, the LED turns green around 90% so you'll need to leave it another few hours after the LED changes. Once you're full, unplug and boot into Android and again use it until the battery is fully drained and you can't power up anymore and you're good to go.
Remember, after wiping stats, during the draining process *do not* plug it in to the charger or your computer as thiss will mess up the calibration.
Its a pain, and takes a day or so, but its worth it. To speed up the draining process, do some process intensive things (video watching, game playing, etc.)
Sent from my T-Mobile G2 using XDA App
OriginalGabriel said:
Charge your phone all the way to 100% (not just until the LED turns green, which is around 90%), unplug and boot into recovery, wipe battery stats, boot back into Android and use your phone until the battery drains and your phone shuts off. Keep trying to power up until it won't any more.
Now, plug your phone in (into the wall, not a computer) and charge until full *without* turning it on. Remember, the LED turns green around 90% so you'll need to leave it another few hours after the LED changes. Once you're full, unplug and boot into Android and again use it until the battery is fully drained and you can't power up anymore and you're good to go.
Remember, after wiping stats, during the draining process *do not* plug it in to the charger or your computer as thiss will mess up the calibration.
Its a pain, and takes a day or so, but its worth it. To speed up the draining process, do some process intensive things (video watching, game playing, etc.)
Sent from my T-Mobile G2 using XDA App
Click to expand...
Click to collapse
Thanks for the tip. Now I have been doing some reading and saw some people recommended charging the phone while it is on when it is fully discharged the first time. You recommend while its off? Does it make a huge difference?
saywhat4118 said:
Thanks for the tip. Now I have been doing some reading and saw some people recommended charging the phone while it is on when it is fully discharged the first time. You recommend while its off? Does it make a huge difference?
Click to expand...
Click to collapse
I don't think it would make that big of a difference; if you think about it though, you're dealing with the battery and battery only if the system is turned off.
Sent from my T-Mobile G2 using XDA App
True we are dealing with the battery but when we wipe the battery stats I think it only wipes the battery information the phone had in its system. So if we wiped the stats when it is full then let it discharge till completely empty, im assuming, you would have to charge it while its on so the phone can now learn what the battery level is and when its full and its capacity. I'm just guessing I could be wrong though. I'm just going to try both and see what happens.
Sent from my HTC Vision using Tapatalk
OriginalGabriel said:
Charge your phone all the way to 100% (not just until the LED turns green, which is around 90%), unplug and boot into recovery, wipe battery stats, boot back into Android and use your phone until the battery drains and your phone shuts off. Keep trying to power up until it won't any more.
Now, plug your phone in (into the wall, not a computer) and charge until full *without* turning it on. Remember, the LED turns green around 90% so you'll need to leave it another few hours after the LED changes. Once you're full, unplug and boot into Android and again use it until the battery is fully drained and you can't power up anymore and you're good to go.
Remember, after wiping stats, during the draining process *do not* plug it in to the charger or your computer as thiss will mess up the calibration.
Its a pain, and takes a day or so, but its worth it. To speed up the draining process, do some process intensive things (video watching, game playing, etc.)
Sent from my T-Mobile G2 using XDA App
Click to expand...
Click to collapse
I have used this method to calibrate the battery and can say that it does have a pretty big impact on battery life. +/- 20% in my case. I also find that I need to re-calibrate roughly once every month or so.
To be clear, there is not such thing as "calibrating the battery", you are calibrating the battery meter (volt meter) on the phone. Maybe its just a semantic distinction, and that is what the OP and subsequent replies are talking about. But many people get this confused, due to the old process of "conditioning" NiCad batteries, which is not applicable to modern cell phone (Li ion) batteries.
In my understanging, you aren't going to increase battery life by doing any of the above, but only making the battery meter more correctly read how much power is left. For instance, if the meter is not properly calibrated, it may read lower than it should. So people think they are increasing their battery life.
I would discourage from discharging the battery to empty. Over discharge of Li ion batteries can possibly (not often, but in a small percentage of cases) prevent the battery from taking a charge. There is a safety circuit which is supposed to prevent over discharge, but it does not always work. Therefore, Li ion batteries should not be discharged lower then 20% whenever possible. Most of us do it from time to time on accident, but there is not reason to do it intentionally. Charge the battery to 100%, drain to 20%, and repeat a couple times. This will get your battery meter plenty accurate. Draining it to empty does not really gain you anything (the battery meter is not that accurate in the best of circumstances, anyway), and can harm the battery.
http://batteryuniversity.com/learn/article/do_and_dont_battery_table
Flashing a new ROM resets the battery meter. So until its properly calibrated, it will give you junk readings. This is one reason why people often jump the gun and think that a custom ROM is getting them poor battery life. Calibrate the meter, and use the ROM for a couple days, then you should get a real indication of what the battery life is like on that ROM.
redpoint73 said:
I would discourage from discharging the battery to empty. Over discharge of Li ion batteries can possibly (not often, but in a small percentage of cases) prevent the battery from taking a charge. There is a safety circuit which is supposed to prevent over discharge, but it does not always work. Therefore, Li ion batteries should not be discharged lower then 20% whenever possible. Most of us do it from time to time on accident, but there is not reason to do it intentionally. Charge the battery to 100%, drain to 20%, and repeat a couple times. This will get your battery meter plenty accurate. Draining it to empty does not really gain you anything (the battery meter is not that accurate in the best of circumstances, anyway), and can harm the battery.
Click to expand...
Click to collapse
I was about to post this. Letting a LiIon discharge all the way is more harmful to the battery than recharging it mid drain cycle.
I'm having a bit of battery issues, I haven't flashed a ROM or calibrated my battery meter. So I charge my phone to full while still on, unplug it and drain it until it turns off (NOT until the battery is completely drained, which could potentially damage the battery), plug it up and let it charge while off, and I should be calibrated?
Do you need to have root to be able to reset battery stats?
Sent from my T-Mobile G2 using XDA App

Excessive Battery Drain Problem

I recently upgraded from a Galaxy I9000M to a Galaxy S III, and I'm loving everything about the phone so far.
...With one exception; the battery has been draining way too fast for me to use it normally. At this rate, I would have to charge it 3 times a day to keep it alive..
I went to sleep last night with the phone on a full 100% charge, and when I woke up, it was at 10% battery. Now, I'm mostly aware of how to keep battery use low (I keep my GPS off, Wifi/3g/LTE off, screen 50% brightness, Sync off, etc.) and it still dies way too fast. I'm reading reviews and reports of people getting a full days use out of it with no problems.
http://i.imgur.com/jauwE.png
Here is my battery drain after ~2H from 100%, with the phone virtually UNTOUCHED.
http://i.imgur.com/qES9U.png
App list
http://i.imgur.com/N6TrM.png
top app draining my battery seems to be the System.. not quite a rogue app...
-- It seems as if something is keeping the phone in an "awake" state, killing the battery?
Any ideas as to what could be killing my battery so fast?
EDIT: It's also worth mentioning that the phone is on Stock rom, Unrooted.
Checking wakelocks with BetterBatteryStats
Sent from my SAMSUNG-SGH-I747 using xda premium
avarize said:
Checking wakelocks with BetterBatteryStats
Sent from my SAMSUNG-SGH-I747 using xda premium
Click to expand...
Click to collapse
I'll do that now, and I'll let it run overnight. Thanks.
For the moment, I uninstalled Lightflow, and it looks like it's gotten much better. My phone went to sleep for the first time in two days :good:

Solution for battery problems

after talking to lg and rogers i found a way to fix my battery bug or what ever it was........
Issue: weak battery-very bad battery life-needed to charge twice a day on normal usage. Lg and rogers both said its a hardware issue and need to be replaced......(IT WASNT)
Solution few easy steps should fix it:
1. Let your battery die to 0%. It drives down by 2%. Turn it on, it will let you turn it back on and shots automaticly back down. do it a few times till it shows0%!!
2. Plug it into your charger and let it charge to 100%.
right now its 2 pm i started using the phone at 9 am haevy!! besides that is my s3 that i used half as much today. Battery life on the optimus G is 60% and on the S3 55%. Battery life of the LG seem to went to normal. they claim its 40% better then on the s3. im trying tomorow on eco mode see if there is a difference.
PS: sorry for my english im italian live in canada and grew up in germany haha
I'm not so sure this is a good thing to do. I've read that you should never allow a Li-Po battery to drain completely because it physically damages it.
Then again, it's hard to find credible information on the subject.
Edit: Wikipedia cites the following article which states that overdischarging will damage the battery: http://www.powerstream.com/li.htm
xxbeanxx said:
I'm not so sure this is a good thing to do. I've read that you should never allow a Li-Po battery to drain completely because it physically damages it.
Then again, it's hard to find credible information on the subject.
Edit: Wikipedia cites the following article which states that overdischarging will damage the battery: http://www.powerstream.com/li.htm
Click to expand...
Click to collapse
Damage is when you leave battery discharged for some time, short period = almost 0. Of course there is little damage by doing this but no more than frying your phone at 100% Sorry for my english..
Fixed mine tho my battery life is crazy long now
Sent from my LG-E971 using xda app-developers app
It calls the placebo effect.
Li-polymer batteries calibrated on factory and they absolutely dont like deep discharging.
By the way LG promised 800 cycles of charging before the battery will start dying. I think in case of full discharge, the amount of cycles will be greatly reduced.
I have provisioned my battery which means going from full charge to 0 three to 4 times when I first got it and I always get a full day with medium use now.
Sent from my LG-E973 using xda app-developers app
I'm wondering, if this provisioning is so helpful for a battery, why wouldn't they do it at the factory?
After reading your guys' posts I decided to do a bit of a test.. I ran my phone all the way down from 100 to 0.. phone turned off.
Then, I turned my phone on about 5 times which then would immediately shut off onve booted to the os.
Then, I turned the phone on and placed it in the recovery mode.. doing this ensured that the screen stayed on until the phone was indeed drained entirely.
Then I charged it up till 100% before I went to bed, turned airplane mode on, closed the screen and went to bed.
Wake up this morning and looked to see how much battery drain occurred during sleep.
After about 5 minutes of using my phone it dropped down to 97%.. only lost 3% overnight. I was very pleased to see this as it confirms in my case that the phone is able to go into deep sleep.
I've also noticed that my battery seems to be draining slower than before.. before I could surf the web for ten minutes over wifi and lose a full 10% of battery.. so far today I've been on the web, downloading email, messing with some apps for around an hour or so and I'm currently at 86%.. definite improvement I believe.
And FYI this is with eco mode off, screen at 50% brightness, no gps and sync on sparingly. This is also on the latest update (my phone is on bell)
scoobydooby said:
After reading your guys' posts I decided to do a bit of a test.. I ran my phone all the way down from 100 to 0.. phone turned off.
Then, I turned my phone on about 5 times which then would immediately shut off onve booted to the os.
Then, I turned the phone on and placed it in the recovery mode.. doing this ensured that the screen stayed on until the phone was indeed drained entirely.
Then I charged it up till 100% before I went to bed, turned airplane mode on, closed the screen and went to bed.
Wake up this morning and looked to see how much battery drain occurred during sleep.
After about 5 minutes of using my phone it dropped down to 97%.. only lost 3% overnight. I was very pleased to see this as it confirms in my case that the phone is able to go into deep sleep.
I've also noticed that my battery seems to be draining slower than before.. before I could surf the web for ten minutes over wifi and lose a full 10% of battery.. so far today I've been on the web, downloading email, messing with some apps for around an hour or so and I'm currently at 86%.. definite improvement I believe.
And FYI this is with eco mode off, screen at 50% brightness, no gps and sync on sparingly. This is also on the latest update (my phone is on bell)
Click to expand...
Click to collapse
I'd be really tempted to try this, but I've heard so much from so many credible sources that total drain on Li-ion is bad news. Conflicted
ionian2 said:
I'd be really tempted to try this, but I've heard so much from so many credible sources that total drain on Li-ion is bad news. Conflicted
Click to expand...
Click to collapse
It's bad to constantly cycle it full to empty. A full cycle once in a while is fine and on some devices it's necessary to calibrate the battery. Additionally, it's not good to store the battery empty. There's no harm in letting it drain all the way occasionally although killing it then further killing it in recovery is probably overkill.
Sent from my LG-E973 using xda app-developers app
Indeed, I only did it in the hopes that it would help to recalibrate the battery.. I recently was forced to run a flash back to the original firmware using the kbz method.. I was able to bring back to stock but noticed afterward that my battery life did not seem anywhere near as good as it was prior.
It could be that the kbz I flashed to was the newest updated version and it just isn't as good with the battery life but I felt it was worth trying draining all the way to see if it would help.. it does seem to have helped a bit though my battery still shows that android system keeps awake for 4+hours which is odd..
Anyway, once in a while I don't see it being a big deal.
If anyone is going to attempt the things mentioned here, why not do us all a favor and post some actual numbers from Better Battery Stats (a before and after) for some real analysis.
I'm not implying that anyone is lying, but it is just too easy to perceive an improvement when that is what one is expecting.
The plural of anecdote is not data.
dpvu said:
It's bad to constantly cycle it full to empty. A full cycle once in a while is fine and on some devices it's necessary to calibrate the battery. Additionally, it's not good to store the battery empty. There's no harm in letting it drain all the way occasionally although killing it then further killing it in recovery is probably overkill.
Sent from my LG-E973 using xda app-developers app
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according to my experience, the original one is the best

heavy battery drain issues by android OS

Hi, I have bought a G Pad for my mother-in-law, and recently she started complaining on the battery life. Indeed I have noticed, that after fully charging and leaving the device idle it looses 40% of the battery over 12 hours. I have made a factory reset, but the battery has drained 12% in 12 hours with everything off and a few minutues of screen on time (only used to for the initial set up after the reset). Also I have the feeling that the drain increases with every hour.
Battery stats say that Android OS is the most heavy drainer. Do you have any suggestion how to fix this (besides trying a different ROM - i don't want to do this at the moment).
Thank you
molnartibor said:
Hi, I have bought a G Pad for my mother-in-law, and recently she started complaining on the battery life. Indeed I have noticed, that after fully charging and leaving the device idle it looses 40% of the battery over 12 hours. I have made a factory reset, but the battery has drained 12% in 12 hours with everything off and a few minutues of screen on time (only used to for the initial set up after the reset). Also I have the feeling that the drain increases with every hour.
Battery stats say that Android OS is the most heavy drainer. Do you have any suggestion how to fix this (besides trying a different ROM - i don't want to do this at the moment).
Thank you
Click to expand...
Click to collapse
Try to use wakelock detector and greenify to check and stop the process that could be causing this battery drain.
Sent from my LG-V500 using XDA Premium mobile app
Do you have an SD card in it? Try taking it out and see if the battery drain goes away. A bad SD card will cause android to keep scanning the card...
Sent from my LG-V500 using Tapatalk

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