Database Users

battery drains completely in less than 12 hours

On Galaxy S I9000.....what can I do to fix it? This happens even with minimal usage.

Which rom?

malcho said:
Which rom?
Click to expand...
Click to collapse
2.3.4 Gingerbread xxjvp

try to overcharge your phone and see if there still any battery drainage!

I have same "problem". It will be fixed when there's been few batterycycles.
Sent from my GT-I9000 using XDA Premium App

I've only had this rom for 1 day.
Sry for doublepost.
Sent from my GT-I9000 using XDA Premium App

I have this issue on Darky 10.1 (2.6 kernel), 2.3.3
Battery lasts around 10 hours with light to medium usage (its a new original Samsung battery as well).
Does anyone have any quick advice to fix this? Bit under time pressure due to job at the moment and don't have much time to research this. Any advice to fix this easily and quickly?

I had this problem after switching on the “Vorabruf über Mobilnetz“ in the Cache-Settings of Google Maps. Maps was closed, but battery was fast going down. Using XWJVH.
Sent from my GT-I9000 using XDA App

I too have almost the same problem with Darky Rom 10.1 - but I've heard that it has been fixed in the new beta version. I'm gonna flash it at the end of the week and after a few days of observing, I'm gonna tell you the results.

Jobiza said:
I have same "problem". It will be fixed when there's been few batterycycles.
Sent from my GT-I9000 using XDA Premium App
Click to expand...
Click to collapse
It's been through quite a few cycles.

I think I figured it out.....I think it was Skype. If you sign in the app is always on...it doesn't have an exit feature. There is, however, an app to close it. I used it and got normal battery life today!
We'll see if it keeps working like it should.

So I've upgraded to 2.3.4, (Ficeto.Deodexed.XXJVP) and Android OS battery drain stopped. Now it shows 70% battery usage on display (before it was 70% android OS). I recommend updating your system too

with darky on medium use never had more than 14 hrs )

I've given up for the moment and gone back to Darkys 9.5
Now at least I can get through one whole day and have about 40% left

Diaf82 said:
2.3.4 Gingerbread xxjvp
Click to expand...
Click to collapse
Are you willing to flash the rom again? or you can try to use the speedmod 15g t11 for the kernel to replace the JVP kernel.

it's said that when you use the USB connection to your PC, you need to reboot it. So this battery drainage will not happen.
In the ROm 2.3.3 JV5 and JV6 for Asia, I do the same to keep the batter alive.

Try backing up everything and then factory reset phone. Generally this happens because of a few unwanted applications excessively using ur processor, in turn draining battery or there may be a malware that stealthily connects itself to the net. This will almost certainly cure the disease. If it doesn't, then there is a serious defect in ur hardware or some of ur system app required for properfunctioning of the phone is corrupted, causing excess pressure on the processor

It is a big problem to everyone, I charge twice per day for this.

Calibrate your battery
Let the battery go down to 0% and turn off
Then turn the phone on, it'll turn itself off again cause battery is low
Keep doing this until its totally 0%
Plug in the charger, charge it to 100%
Turn the phone on
Download SGS Tools from the android market place
Run the app
Go to "scripts"
click delete battery stats
Unplug charger & you're done
battery should be more stable now
go to settings
applications
running services
check what you have in the background
close them down if they're unecessary
I get through the workday with only 10% loss

If you have an really old SIM card, try and replace it with a brand new one. This may also help. I had bad battery run time with two LG Optimus 2x phones (about 10 hours) and not so stellar 20 hours with the i9000. Finally I stumbled over some advise to replace old SIM cards. Since mine was over 12 years old, I ordered a new one. It is not gonna change the world, I know, but it was worth a try .

Battery Drain Issue - 2.3.4 Update

I read few thread and tried like Calibrating Battery, Clearing battery stacks etc. I'm has flashed the ftf file and Pre-rooted image. The draining issue only happens if the WiFi is On. If I turn off the WiFi it works just fine. Otherwise the device will get heated and the battery will go down like crazy, Within 1 hour around 10% goes down when the phone is in idle. I turned off all the sync. I re-flashed the firmware as well still no luck. I only have Launcher Pro and Widget locker installed rest is stock. I removed few apps like Fun download etc. I also freezed Maps using Titanium backup. My only theory it could be a buggy kernel because it didn't happen in the previous build. But I also tired with DoomKernel (test version) no luck. I'm kinda scared to flash the old firmware back because I see lot of RED Light issues. What else you think could be the problem?

try the stock kernel. remove unwanted apps from system or freeze them via titanium backup
try the manual network search instead of auto. and lastly try the stock kernel
Sent from my LT15i using xda premium

gonemad02 said:
try the stock kernel. remove unwanted apps from system or freeze them via titanium backup
try the manual network search instead of auto. and lastly try the stock kernel
Sent from my LT15i using xda premium
Click to expand...
Click to collapse
Just a little reluctant to lose the root

ShyamSasi said:
I read few thread and tried like Calibrating Battery, Clearing battery stacks etc. I'm has flashed the ftf file and Pre-rooted image. The draining issue only happens if the WiFi is On. If I turn off the WiFi it works just fine. Otherwise the device will get heated and the battery will go down like crazy, Within 1 hour around 10% goes down when the phone is in idle. I turned off all the sync. I re-flashed the firmware as well still no luck. I only have Launcher Pro and Widget locker installed rest is stock. I removed few apps like Fun download etc. I also freezed Maps using Titanium backup. My only theory it could be a buggy kernel because it didn't happen in the previous build. But I also tired with DoomKernel (test version) no luck. I'm kinda scared to flash the old firmware back because I see lot of RED Light issues. What else you think could be the problem?
Click to expand...
Click to collapse
i have exactly the same problem with a NEO, all stock no root no nothing, there is for sure a problem with this firmware.

I'm still on the 2.3.3, but i have noticed a similar effect. This was caused in my case by my email program (com.android.email). By killing the service, the batterydrain went to normal. By starting email again, the batterydrain goes to around 10% per hour and a warm phone. Also there is a lot of bandwidth used!!! up to 20 mb per hour.
I finally got off my lazy ass and jus tremoved all my email accounts and am re-adding them now one by one. Up until so far, it does seem to work.

eface said:
I'm still on the 2.3.3, but i have noticed a similar effect. This was caused in my case by my email program (com.android.email). By killing the service, the batterydrain went to normal. By starting email again, the batterydrain goes to around 10% per hour and a warm phone. Also there is a lot of bandwidth used!!! up to 20 mb per hour.
I finally got off my lazy ass and jus tremoved all my email accounts and am re-adding them now one by one. Up until so far, it does seem to work.
Click to expand...
Click to collapse
in my case, on the neo the bigges power consumption is coming from the android system, and i cannot stop that process

may be the solution to this problem ...
http://forum.xda-developers.com/showthread.php?t=1278213

The phone stops charging the moment it reaches 100%...!!! When charger is removed it goes down to 99% in few minutes...!!! Earlier it used to take 4-5 hours before coming to 99% from 100%...!!! Everything else is fine...!!! I don't think that just keeping the wifi on causes such a battery drain for me, but yes if i keep surfing and keep my display on the whole time then it drains around 15-20% an hour...!!! Is that a problem...!!!
Sent from my LT15i using XDA Premium App

adiktz said:
The phone stops charging the moment it reaches 100%...!!! When charger is removed it goes down to 99% in few minutes...!!! Earlier it used to take 4-5 hours before coming to 99% from 100%...!!! Everything else is fine...!!! I don't think that just keeping the wifi on causes such a battery drain for me, but yes if i keep surfing and keep my display on the whole time then it drains around 15-20% an hour...!!! Is that a problem...!!!
Sent from my LT15i using XDA Premium App
Click to expand...
Click to collapse
I have the same issue, it started on .368 firmware.
now I'm getting weird battery status readings, for ex: when charged to 100% after few hours of not using it reaches 60~50%, I turn it off, pull out the battery and put back in then turn it back on, it shows 80~70%

im having serious wifi problems, anyone know a safe method to flash back? i just got my phone replaced to, i dont want to run into the 0% battery issue again

I have the exact same battery issues since .368. For example, I unplugged the phone 24 minutes ago at 100% and now it's down to 97% on stock kernel (.283) and with the screen off the whole time....
Sent from my LT15i using xda premium

I tried the stock kernel as well. Still the same problem. I really like to know if it's hardware or software.

I am having the same problem, with lots of heat generated when making calls so much it makes my ear sweat onto the screen. Also there is a huge amount of heat generated when i use data, the battery reduces at 1 % / minute when using data, and also quite a bit when im using the music player also. I hadnt noticed this before as i wasnt using it for every day use because it was sim locked. im scared to go back firmwares because of the 0% battery issue. Im not interestd in root is it ok just to flash back and not root?

crimilde said:
I have the exact same battery issues since .368. For example, I unplugged the phone 24 minutes ago at 100% and now it's down to 97% on stock kernel (.283) and with the screen off the whole time....
Sent from my LT15i using xda premium
Click to expand...
Click to collapse
See what apps are running, I have this problem when my maps are running in the background, then I do a force stop, or undo the update on maps
Sent from my LT15i using XDA Premium App

adiktz said:
The phone stops charging the moment it reaches 100%...!!! When charger is removed it goes down to 99% in few minutes...!!! Earlier it used to take 4-5 hours before coming to 99% from 100%...!!! Everything else is fine...!!! I don't think that just keeping the wifi on causes such a battery drain for me, but yes if i keep surfing and keep my display on the whole time then it drains around 15-20% an hour...!!! Is that a problem...!!!
Sent from my LT15i using XDA Premium App
Click to expand...
Click to collapse
I have the same problem, I turn off the phone charge unplug turn on the phone and charge again, also if you are running a battery app turn it off before charging
Sent from my LT15i using XDA Premium App

Poker gypsy said:
See what apps are running, I have this problem when my maps are running in the background, then I do a force stop, or undo the update on maps
Sent from my LT15i using XDA Premium App
Click to expand...
Click to collapse
Thanks for the reply.
There are just the system apps, the keyboard, the clock widget, music player equalizer, e-mail client and setcpu... basically the same apps as before, as I didn't do any major change since I was on .145.
I checked for maps and it wasn't running.
I guess the battery life is indeed poorer since the last two updates, but at least they have better RAM management than in .145.
Anyways, I have a computer around most of the time (either at home or at work) so I can always charge it, but it's a bit frustrating to see the battery go down like hell when I'm not even doing much with the phone. I mean even a friend of mine who owns an SGS II has slightly better battery life, and that's a dual-core...

ShyamSasi said:
I tried the stock kernel as well. Still the same problem. I really like to know if it's hardware or software.
Click to expand...
Click to collapse
i'm all on stock and have this problem, and i'm sure this is a kernel/firmware problem that everybody has, just that they didn't realize it yet.... hope they will bring a new firmware out soon that will fix this.

lupu666ro said:
i'm all on stock and have this problem, and i'm sure this is a kernel/firmware problem that everybody has, just that they didn't realize it yet.... hope they will bring a new firmware out soon that will fix this.
Click to expand...
Click to collapse
same with me ... AGREE

It's not great news. I am still on .145 and battery life is AMAZING.

Poker gypsy said:
I have the same problem, I turn off the phone charge unplug turn on the phone and charge again, also if you are running a battery app turn it off before charging
Sent from my LT15i using XDA Premium App
Click to expand...
Click to collapse
Don't have anything like battery app installed...!!!
Sent from my LT15i using XDA Premium App

battery?

im running the stable cm7 release and my battery life is terrible. i followed the guide on the forums here on fixing your battery life, charging to 100% pull battery put back in instal battery fix etc and overnight (short 5 hour night btw) i lost over 25% of my battery life, doing nothing ! wifi off data was on but i only recieved one or two emails all night. is this normal for cm7?
i read about how people are getting 20+ hours battery life while using their phone, if i leave my charger at home and go to work my phone is DEAD halfway through and all i use it for is the occasional phone call mabye 5-10 texts throughout the day and an email or two... how can i fix this?

I read somewhere that if you flash another ROM with battery not fully charged, it messes up calibration and you have to calibrate again. I am still with stock Blur just because I read so many issues with so many people about batteries
I hope you can get it figured out.

anybody?
is anybody else having battery life issues with cm7? if not did you do something to fix it? i have no idea what to do, the phone pretty much has to be tethered to a charger or it gets drained ridiculously fast. If i hang out with a few friends and use my phone during it i literally have to stop using it after around an hour or so because the battery's about to die.
Is there a certain rom with exceptional battery life that i can try to see if mabye its a hardware related issue? i seem to remember having horrible battery life for the day? or so that i was running stock ATT gingerbread.

I use Aura 1.2.2.2 (debloat) and get average battery life. Comparable to what I got before I installed third party ROM. If you want to try that one and see if its just CM then give it a go.
I had a battery problem after flashing to CM with a previous phone (OG Droid) but it was because I flashed while I had the phone plugged into the charger. It took a while to get it back to normal.
I doubt its CM. I dont know if its something draining your battery in the background or if its a result of weird calibration due to the flash.

my battery life has never been hte greatest but recently i got it working really well
I use the latest weekly build of CM7 and here is what i did
upon fresh install:
wipe battery stats
THEN:
kill battery
charge as far as it will go
clear battery stats (use battery calibration app)
take out battery
wait to reboot(missing battery)
put it back in
let it charge for 2hrs
reboot and unplug
kill the battery
charge to 100% while off (no interuptions)
Enjoy!
i have found that the more cycles my battery goes through 100-0-100
the better it gets
these steps almost tripled my battery life (along with Weekly 3)

there is a bug some people report with CM7 about the suspend process. (i have it, you can search "suspend" in the CM7 thread and see others are as well) load up the app betterbatterystats (there is a thread on xda that has the apk) and see if you have that bug.

I'm on nightly 20 having good battery life
Sent from my MB860 using xda premium

I'm a victim of the suspend process bug
had to flash something else, using ALIEN for now and battery is pretty good
Sent from my MB860 using XDA App

i installed betterybatterystats as you guys recommended and im not entirely sure how to read it but the suspend process shows at the top of the list so i assume thats the process which is eating up my battery? Is there a fix for this? i do like cm7 but if its the rom which is causing my battery life issues ill have to wave goodbye. Does this suspend process but happen on the weekly / nightly builds as well?

I was having horrible battery life as well. I froze some apps that I downloaded from the market and that helped a little bit but what gave me 20+ hours of battery life is the new UK orange Radio that has recently been released. I wanted to flash it since I am using an Orange UK phone and see if it improves my wifi connection, etc....
Reddy flashing a radio appropriate to your device and see if it helps.
Sent from my MB860 using XDA App

I had it on stable, and am on weekly 3 right now. I'm probably going to switch back to a blur rom soon..
Sent from my MB860 using XDA App

My battery blows with CM7. My phone has the suspend bug and nothing fixes it. I tried a fastboot wipe and clean install of the latest stable as well as nightly #20. I've tried several kernels, I'm currently running a screen off profile of 216-216 on the 1.0ghz kernel and I'm undervolted to the max just to make it thru the day.
I'm getting the nexus prime or the iPhone 5 next... which ever is released first.
Sent from my MB860 using XDA Premium App

Cm7.2 Battery Drain

I flash CM7.2 few days ago and I'm fall in love with it
But, 5 days later, I'm not impressioned with battery life on CM7.2. It is better on stock ROM I cleared battery stats after flashing, but battery duration is not improved. CPU governor was INTERACITIVE and battery have life duration about 6-7 hours with low/medium using. Unacceptable!
Then, I change CPU governor to ONDEMAND and battery is better for a 1-2 hours. But, not better enough. 8-9 hours with medium usage is still smaller than with stock ROM (12-13 hours)
I won't to restore stock ROM, a love CM...
My dipslay have brightness around 30% (on stock was on 50% or on auto) and I thing that there is some issues with brightness in CM7.2.
Before I reboot phone, battery level was around 60%. When booted again 66%. Few minutes later, it was 60% again. That you can see on screenshot.
Every morning when I wake up, CM showing battery level for 1% smaller than 8 hours ago. But, 10-15 minutes later, it drain 10-15% battery.
I'm using stock kernel.
May someone help me to fix this?

Wipe the phone again and flash the rom again

****head said:
Wipe the phone again and flash the rom again
Click to expand...
Click to collapse
Are you sure that reflashing will solve problem?

Did you flash another kernel ?
I'm running CM7.2 for about 4 months now, and previously RC1, RC2 and 7.1, and I'm not having any issue.
I use the interative governor (min 245, max 1024), I get at least a 12 hours battery life upon normal to heavy use.
If I don't use a lot my phone, I can get up to 36h.
I remember I tried LordModUE 8.9b7 kernel and the battery life was better and performance excellent (governor was smartassv2).

ciberbeb said:
Did you flash another kernel ?
I'm running CM7.2 for about 4 months now, and previously RC1, RC2 and 7.1, and I'm not having any issue.
I use the interative governor (min 245, max 1024), I get at least a 12 hours battery life upon normal to heavy use.
If I don't use a lot my phone, I can get up to 36h.
I remember I tried LordModUE 8.9b7 kernel and the battery life was better and performance excellent (governor was smartassv2).
Click to expand...
Click to collapse
How to change kernel from stock to LordModUE?
Thanks

1. Download the last available kernel : http://forum.xda-developers.com/showthread.php?t=1085725 or directly : http://blackice.omca.co.uk/download...ger-kernels/lordmodUEv8.9-CFS-b7-2WCR-TUN.zip
2. Put the zip on your sdcard
3. Reboot into recovery
4. Make a nandroid backup !!
5. Flash the kernel
6. Reboot and enjoy
EDIT: another good thing is to use currentwidget (https://play.google.com/store/apps/details?id=com.manor.currentwidget&hl=fr), do a full charge until you reach 0mA, then reboot into recovery, wipe your battery stats, let your phone reach 0mA again, then unplug your phone. This should fully reset your battery, and let your ROM properly calibrate it.
Thanks to that post : http://forum.xda-developers.com/showthread.php?t=1226016

I installed Kernel from your link but in about phone menu, there is version:
2.6.35.14-cyanogenmod-g295e82f
[email protected] #1
Is this correct?
EDIT: After flashing, my Wi Fi not work... There is ERROR when open Wireless & Networks...
EDIT2: I reflashed kernel, wipe/factory, wipe cache, but i cant start Wi fi
What to do?

Reflash the rom, after wipe/factory.

tonn3k said:
Reflash the rom, after wipe/factory.
Click to expand...
Click to collapse
Ok, just doin' that

With my DHD LordModUE kernel wont to start Wi Fi. I tried earler versions and result is same

mikronac.ns said:
Ok, just doin' that
Click to expand...
Click to collapse
Yes.
I was on CM7.2 a few weeks ago. I got pretty good battery life. About 2 full days.
I only used 2G & WiFi.

One thing you have to know about flashing a new kernel is that you absolutely need to first boot the ROM with its original kernel first !
As you seem to have many problems, you should:
- full wipe/factory reset, reformat everything except your sdcard
- check the md5sum of the zip (rom especially) on your sdcard
- be sure your battery is fully charged
- flash the rom
- boot it, do not link with your google account
- let your battery charge again
- wait a few minutes
- unplug your phone and reboot
- link your google account
- test if you still have a battery drain but do not install any application, as some of them could cause your battery issue
- make a nandroid backup
- flash the other kernel if needed
- restest battery draining
Hope it'll help !

I did all what you write to me. Now, i testing battery life.
Sent from my Desire HD using xda app-developers app

mikronac.ns said:
I did all what you write to me. Now, i testing battery life.
Sent from my Desire HD using xda app-developers app
Click to expand...
Click to collapse
If you're still having battery drain after following all the useful tips you were giving, it's a possibility it could be the battery it self. You may want to try a different battery to see if you get better results.

It's not possible because it works good on stock rom 6 days ago...
Sent from my Desire HD using xda app-developers app

mikronac.ns said:
It's not possible because it works good on stock rom 6 days ago...
Sent from my Desire HD using xda app-developers app
Click to expand...
Click to collapse
My Inspire has CM7 right now and the battery life is great, so I don't know why you're having issues then.

Dont know
I tried everything... now, I'm on battery for 2 hours and my battery level is 83%... wifi on, display brightness 25%...
Sent from my Desire HD using xda app-developers app

mikronac.ns said:
Dont know
I tried everything... now, I'm on battery for 2 hours and my battery level is 83%... wifi on, display brightness 25%...
Sent from my Desire HD using xda app-developers app
Click to expand...
Click to collapse
Sorry, just lurking. Do you have a GB radio? I've found that running an ICS radio w/ CM7 causes overheating & major battery drain on some devices.
BTW I know nothing about your device.
Sent from my Incredible 2 using xda app-developers app

I have GB radio...
Sent from my Desire HD

mikronac.ns said:
I have GB radio...
Sent from my Desire HD
Click to expand...
Click to collapse
Did you change to a bright screen background or do anything differently?
Batteries can go bad fairly quickly.
You could always reflash. Sometimes a fresh wipe is nice (no pun intended)
Sent from my Incredible 2 using xda app-developers app

s2 in jb 4.1.2 battery life

hi. I am o supernexus build 5 wth siyah kernel. I got round 7 hiurs if heavy usage on gs2. I've done facebook, viber, internet using stock browser and downloading around 200mb zip file. what can you say about this battery life. its my first time to use gs2 and I am using 2000mah. the battery life seems pretty bad in my opinion. I will attach screenshot of my hardware info, battery use and screen time. hoping for any opinions out there
Sent from my GT-I9100 using xda app-developers app

I think is good , for me with stock battery (1650mah) i get 3 hours and 30-40 minutes (screen on time), wifi on , screen brightness auto
Send from my SGS2 I9100 with HassanROM and latest DorimanX 8.xx kernel

I think the battery life should be better with a 2000mah battery..
Is the battery properly callibrated??

krazy1101 said:
I think is good , for me with stock battery (1650mah) i get 3 hours and 30-40 minutes (screen on time), wifi on , screen brightness auto
Send from my SGS2 I9100 with HassanROM and latest DorimanX 8.xx kernel
Click to expand...
Click to collapse
oh really that means I should be getting better because I am on 2000mah but it seems not. Im not sure what's the problem if its the battery or the kernel. I also used an ICS firmware from Samsung I9100TDULP4. I don't know if that affects the battery life
Sent from my GT-I9100 using xda app-developers app

peRFect! said:
I think the battery life should be better with a 2000mah battery..
Is the battery properly callibrated??
Click to expand...
Click to collapse
Well I dont know if it is properly calibrated. By the way I got this unit from my uncle so I am not really sure if the battery is still good. How do we know if its still good. I dont know how old is this battery. How do we calibrate the battery and does the room affect this battery life?
Sent from my GT-I9100 using xda app-developers app

by the way I just installed this rom A week ago. The battery takes 3-4 hours to be charged using my xperia charger
Sent from my GT-I9100 using xda app-developers app

I have suggestion for you , go to miuiandroid.com and download the latest build , install Siyah Kernel v6.0b5 with that and you will love the battery timing on that (Trust me, i am using it right now)

Mr.KiLLeR said:
I have suggestion for you , go to miuiandroid.com and download the latest build , install Siyah Kernel v6.0b5 with that and you will love the battery timing on that (Trust me, i am using it right now)
Click to expand...
Click to collapse
you mean downloading the miui rom? yeah definitely I'll give it a try after slimbean which I will try if I see no improvement on the bAttery. Has anyone had 2000mah and siyah kernel with supernexus rom build 5? What are your timings?
Sent from my GT-I9100 using xda app-developers app

infinitylook said:
you mean downloading the miui rom? yeah definitely I'll give it a try after slimbean which I will try if I see no improvement on the bAttery. Has anyone had 2000mah and siyah kernel with supernexus rom build 5? What are your timings?
Sent from my GT-I9100 using xda app-developers app
Click to expand...
Click to collapse
I have tried Slim Bean too and after trying that i came to Miui Rom

anyone who have experience with 2000battery
Sent from my GT-I9100 using xda app-developers app

anyone who have experience with 2000battery
Sent from my GT-I9100 using xda app-developers app

right now I am using the original 1650 mah stock battery of s2. I've been doing a lot of file transfers as of this moment via e.s. file explorer and currently I am transferring almost 13gb of data via wifi from my laptop. its been awake for 4 hours now with screen time of 1 hour and 30min. e.s. file explorer is keeping the system awake for 3 hours. I did some facebook and viber chats. screen at 35% brightness.. do you think this is the expected life of the stock battery? I am fairly new to samsung and I found the battery life to be disappointing even with the stock jelly bean rom from samsung. I will post some pics of the battery stats and cpu stats from cpu spy. another thing though. is there a good app from the market where I can test my two batteries and compare them? thank you
Sent from my GT-I9100 using xda app-developers app

infinitylook said:
right now I am using the original 1650 mah stock battery of s2. I've been doing a lot of file transfers as of this moment via e.s. file explorer and currently I am transferring almost 13gb of data via wifi from my laptop. its been awake for 4 hours now with screen time of 1 hour and 30min. e.s. file explorer is keeping the system awake for 3 hours. I did some facebook and viber chats. screen at 35% brightness.. do you think this is the expected life of the stock battery? I am fairly new to samsung and I found the battery life to be disappointing even with the stock jelly bean rom from samsung. I will post some pics of the battery stats and cpu stats from cpu spy. another thing though. is there a good app from the market where I can test my two batteries and compare them? thank you
Sent from my GT-I9100 using xda app-developers app
Click to expand...
Click to collapse
To callibrate battery..first completely drain the battery to about 5%, then charge the phone non stop without disturbing it till 100% and immediately remove the charger..again fully drain the battery and follow the above steps and u will get better battery life after a few cycles!
About roms..battery life does differ from rom to rom...i suggest u could check the custom kernels packed with zzmoove governor, ithat particular governor definitely improves the battery backup!
And in the above post es file explorer is eating ur battery..for that u should download greenify and hibernate apps continuously running in background!

great. I will follow your steps. one more thing. how can I know if the battery is still good or if its still holding the proper charge its suppose to have? thanks
Sent from my GT-I9100 using xda app-developers app

best I can get is about 3 days standby in jb stock.

I use the 2000mAh battery is primary battery.. no big surprise to expect here, capacity is just 21% more by construction...
With wifi on, JB burns in my case about 3% in IDLE.. stock kernel.. and about 5% in 3G mode, IDLE.. then battery drains more or less fast depending on screen on, phone calls etc. I use the phone extensively for work (email sync & replies, phone calls, sms and voip) and i have to topup the battery twice or trice a day!
Have tried various custom kernels with all sort of magic to reduce battery drain.. more or less effectively.. sometimes with less stability.
Right now trying out latest dorimanx 8.27.. seems thatn IDLE with WIFI on drains around 2% per hour.. better than stock.. still not quite awesome
I miss the GB battery life.. but JB is so beautiful in comparison, I cannot go back!

jmarcnms said:
I use the 2000mAh battery is primary battery.. no big surprise to expect here, capacity is just 21% more by construction...
With wifi on, JB burns in my case about 3% in IDLE.. stock kernel.. and about 5% in 3G mode, IDLE.. then battery drains more or less fast depending on screen on, phone calls etc. I use the phone extensively for work (email sync & replies, phone calls, sms and voip) and i have to topup the battery twice or trice a day!
Have tried various custom kernels with all sort of magic to reduce battery drain.. more or less effectively.. sometimes with less stability.
Right now trying out latest dorimanx 8.27.. seems thatn IDLE with WIFI on drains around 2% per hour.. better than stock.. still not quite awesome
I miss the GB battery life.. but JB is so beautiful in comparison, I cannot go back!
Click to expand...
Click to collapse
Does Jb stock for you has better life or does custom rom have more? I really like the custom roms but as per observation stock rom offers more battery time. Right now I just reverted to stock rom i9100xwlss. Touchwiz really sucks. Supernexus is really beautiful but offers less battery (but I will have to try yet their latest build). Also one of the reasons for going back to stock is the camera shot quality. Custom roms really have poor camera quality. I guess when it comes to lowlight shots the stock roms are best. So much for that. Does stock rom offer more battry for you or custom rom does?
Sent from my GT-I9100 using xda app-developers app

SGS2 Battery Life on 4.1.2
infinitylook said:
hi. I am o supernexus build 5 wth siyah kernel. I got round 7 hiurs if heavy usage on gs2. I've done facebook, viber, internet using stock browser and downloading around 200mb zip file. what can you say about this battery life. its my first time to use gs2 and I am using 2000mah. the battery life seems pretty bad in my opinion. I will attach screenshot of my hardware info, battery use and screen time. hoping for any opinions out there
Sent from my GT-I9100 using xda app-developers app
Click to expand...
Click to collapse
Below is a reply in some other forum by Samsung offcials regarding a specific method to Hard-Reboot your phone after a Firmware update: This method particularly helped me improve the battery life on SGS2 after 4.1.2 update.
"1. I’m sorry you are having issues with your device after upgrading the firmware. I can understand your frustration about this.
Old systems settings can be left on the phone after an update occurs, which is why we usually recommend a full factory reset after updating. If this isn’t done your device may begin to give false readings from system resources, or experience technical problems, which may explain the issue you are having.
We would advise on doing the following, which is designed to reset the settings on your device. Please back up your device using Samsung KIES before you do this.
1) Remove the battery for at least 40 minutes, put the battery back in and allow it to fully discharge. Afterwards, perform a full battery charge with the device turned off. Do not interrupt the charging process.
2) After the battery is fully charged, we would like you to perform a full factory reset, which can be done via Settings > Backup > Reset.
This process will reset your device, remove old system files that are no longer needed and enable your device to operate normally again.
Please let us know if your device continues to experience problems after the reset so we can investigate further.
If you require any further assistance, please contact Samsung again and we will be more than happy to help.
Kind regards,
Stewart
Online Support Team
SAMSUNG Customer Support Centre

infinitylook said:
Does Jb stock for you has better life or does custom rom have more? I really like the custom roms but as per observation stock rom offers more battery time. Right now I just reverted to stock rom i9100xwlss. Touchwiz really sucks. Supernexus is really beautiful but offers less battery (but I will have to try yet their latest build). Also one of the reasons for going back to stock is the camera shot quality. Custom roms really have poor camera quality. I guess when it comes to lowlight shots the stock roms are best. So much for that. Does stock rom offer more battry for you or custom rom does?
Sent from my GT-I9100 using xda app-developers app
Click to expand...
Click to collapse
Actually I only use stock JB.. and trying to get it last longer with some custom kernels.. recently trying snapdragon rom, which is stock JB as well but with some S4 apk made compatible with S2... tried some time back omega, vanila rootbox and some other android builds for s2.. but was facing few stability issues / bugs and also missed some features that i was getting from stock rom.. so i gave up with these... now just aiming at stability and if possible battery endurance.. but not at the cost of stability.