Database Users

SE Stock Rom Advantage!

Hello All,
I noticed there are a lot of posts regarding Battery Usage & Optimization...
I tried many many combinations of custom roms, basebands and kernels and I always face the same battery problem especially when 3G/MobileData is switched on.
I admit that Sony Ericsson gave us a ****ty stock rom with poor kernel however It's still the best rom in managing battery usage.
I made a small comparison on Stock rom VS Custom roms with 3G/MobileData left switched-on and I found the following:
Custom rom(s): battery drain down very fast it goes for 100% to 1% in less than 8 hours (normal apps installed)
Stock rom: battery lasts for 2-3 days with normal daily phone usage (same apps installed as i did in custom rom)
Please share your opinions.
Thanks,
Ayman

I don't agree at all...
Custom roms can have just as good, if not better, battery life.

I personally think this was a good idea. Nice post and info. Just curious, how long did you do this study with the data you got?
Sent from my X10i using XDA Premium App

hey guys, i too have this issue, i dnt know if its device specific. ive had the phone since march(2010) last year and have been modifying it with the great mods that the devs hav given us. everytime i install a custom rom i just get unusual battery drain, like yesterday, i followed instructions to the letter and installed tripnravers miuifroyo 1.0.8 and i lost 10% battery in like 20 minutes n ive hardly used it :-(. so nowadays i stick wiv a modified stock 2.1(ewjet to b exact). im gna buy a new battery and see if i get the same results. i really wna use a custom(2.2+)rom but the battery problems are really putting me off, theres so many people out der that arent really having ny battery drain whcih jus dus my head

Voelker45 said:
I personally think this was a good idea. Nice post and info. Just curious, how long did you do this study with the data you got?
Sent from my X10i using XDA Premium App
Click to expand...
Click to collapse
Thanks Voelker BTW this is my first Thread in XDA, I used to use SE 2.1 stock rom till the first stable Froyo custom rom came out. I switched to Froyo then I started to notice this around 4 months ago and I tried many combination and a lot of optimizations to find out the best one although Stock rom was always better.
@fiscidtox:
I love Foryo and GB much much more than Eclair I currently on CM6 v6 Wolfbreak
Could you please tell me how the battery lasts on your custom rom while MobileData is left switched-on?
Thanks,
Ayman

I get a full day..
If you mean stock with no tweaks then maybe it would last longer, but a lot of that would be not having jit enabled...

sofir786 said:
hey guys, i too have this issue, i dnt know if its device specific. ive had the phone since march(2010) last year and have been modifying it with the great mods that the devs hav given us. everytime i install a custom rom i just get unusual battery drain, like yesterday, i followed instructions to the letter and installed tripnravers miuifroyo 1.0.8 and i lost 10% battery in like 20 minutes n ive hardly used it :-(. so nowadays i stick wiv a modified stock 2.1(ewjet to b exact). im gna buy a new battery and see if i get the same results. i really wna use a custom(2.2+)rom but the battery problems are really putting me off, theres so many people out der that arent really having ny battery drain whcih jus dus my head
Click to expand...
Click to collapse
You must be doing something wrong!
10% in 20 mins isn't normal.
I'm sure if you left it settle this would rectify itself though.

I think the biggest advantage of the stock kernel so far is stability, but the ongoing development for the custom kernel is sucessful to implement some problems such as battery drain caused by unability to go into deep sleep etc..

I never understood needing more than 24 hours on a charge. Charge it while you're sleeping you wont be using it then anyway.

Even if you like the 2.1 Stock ROM for any reason (Stability,Battery,etc) and don't like all these awesome 2.2 and 2.3, you should at least use Eric's JET ROM which is based on the original ROM has no stability issues and has faaaaar better battery life.
But seriously, I`m using Custom ROMs since the first 2.2 ROM by Z and never even cared to get back to the stock ROM.

When I use Wifi custom roms have almost the same battery life as the stock rom. But since I can't connect to wifi at work on any custom rom, im forced to use 3g.. and I need to charge my phone twice a day with almost no usage.

pngface said:
When I use Wifi custom roms have almost the same battery life as the stock rom. But since I can't connect to wifi at work on any custom rom, im forced to use 3g.. and I need to charge my phone twice a day with almost no usage.
Click to expand...
Click to collapse
why not only connect to 3g when you are using it?

fiscidtox said:
You must be doing something wrong!
10% in 20 mins isn't normal.
I'm sure if you left it settle this would rectify itself though.
Click to expand...
Click to collapse
im pretty sure im doin the steps right, but as u sed leaving it to settle shud help this, im gna buy a new battery nyways and try again. i think the wrong thing im doin is not letting it settle, rather i see the battery drain n i jus end up flashing bak to stock. but i shall give wot u sed a go. thanks

fiscidtox said:
why not only connect to 3g when you are using it?
Click to expand...
Click to collapse
I have it set to switch to 2g when the screen is off (I need it on all the time for IM )

can't wait till gingerbread comes out. if the performance is like the arc then I will just stick with the stock rom.

sofir786 said:
im pretty sure im doin the steps right, but as u sed leaving it to settle shud help this, im gna buy a new battery nyways and try again. i think the wrong thing im doin is not letting it settle, rather i see the battery drain n i jus end up flashing bak to stock. but i shall give wot u sed a go. thanks
Click to expand...
Click to collapse
Let it settle for at least two days to see improvement.
Your battery needs to adjust, much like letting your phone build a cache, in order to really see how the rom will effect anything.

Im using the stock rom and my battery lasts a maximum of 2 days with this tweaks: http://forum.xda-developers.com/showthread.php?t=934486
I dont use 3g at all and i use wifi sometimes (session lasts only 10 mins or so)
Brightness is set to "middle" also

Sorry dont agree..
I use wolfbreaks latest rom with the undervolt module.
Juice defender only enables my wifi when i am at home...all other times i have data on with facebook sync.
I now get the same battery life as i did on stock 2.1
Currently I have been unplugged for 1day and 12 hours and I am still at 38%.

fiscidtox said:
why not only connect to 3g when you are using it?
Click to expand...
Click to collapse
3g is useful incase of using Apps such as viber, whatsapp, IM and Gmail as it makes you online and reachable all of the day.

gregbradley said:
Sorry dont agree..
I use wolfbreaks latest rom with the undervolt module.
Juice defender only enables my wifi when i am at home...all other times i have data on with facebook sync.
I now get the same battery life as i did on stock 2.1
Currently I have been unplugged for 1day and 12 hours and I am still at 38%.
Click to expand...
Click to collapse
Honestly I didn't try the undervolt module with wolfbreak's rom, I thought It was developed for stock rom only....I'm gonna give it a try and I'll be back to you with the result.
Thanks,
Ayman

battery drain on jvp please post here

i would like to know if this problem continue on jvp.
it will be much easier to see it in one post instead of following it on 3 different post.

No battery drain for me. I did 34 hours with one charge.
Definitely the best gingerbread rom for me.
Sent from my GT-I9000 using Tapatalk

I also don't have any draining problem after playing gameloft games without restart for almost 2 days.
Sent from my GT-I9000 using Tapatalk

thzone said:
No battery drain for me. I did 34 hours with one charge.
Definitely the best gingerbread rom for me.
Sent from my GT-I9000 using Tapatalk
Click to expand...
Click to collapse
do you have auto rotation on?
Sent from my GT-I9000

I have absolutely no battery drain, 10% lose after 1 day (with playing calls etc included), however I've applied my little solution, deleting all the suspicious system apks

Definitely no battery drain here. Auto-rotation and GPS is ON all the time, played orientation-based and 3d-intensive games multiple times, used Google Maps (just had a nice tour today here in Japan )
By the way I haven't charged yet since I installed this rom 2 days ago.

samsung finally solved it or you did not have the problem before?

same for me right now i am at 1day and 8 hours with wifi on the whole time 3 hrs of calling and texting ,few games,radio etc i always have had the battery drain in the previous roms so this one is looking good

No drain here. With one charge phone now survives two days of intense use.
(stock JVP, dark core kernel, stock bloatware removed, ext4 lagfix)

I surely had it before that is why I started this infamous thread: http://forum.xda-developers.com/showthread.php?t=1039696

No unusual drain here.
In fact this is the best battery efficiency out of any rom (except stock 2.1) I've used. Down to 64% after 24hrs with pretty low usage, which is subjective. To put it in perspective I rarely got past 24hours with typical usage on any 2.2 rom.

94kram01 said:
I have absolutely no battery drain, 10% lose after 1 day (with playing calls etc included), however I've applied my little solution, deleting all the suspicious system apks
Click to expand...
Click to collapse
Wath is this suspicios system apk?
Sent from my GT-I9000 using XDA Premium App

Jeez, unless everyone in this thread is one person, i think we just might have a winning firmware.
Sent from my SGH-I897 using Tapatalk

Android System at 18%, Android OS at 4%.
39min on battery and it went down 2% with nothing running, only wifi on, screen off most of the time.
Doesn't look good for me. About to calibrate battery, but just letting you know.

ghenn4 said:
No drain here. With one charge phone now survives two days of intense use.
(stock JVP, dark core kernel, stock bloatware removed, ext4 lagfix)
Click to expand...
Click to collapse
what apps do you class as stock bloatware ? as im going to do the same as you !

p34nuTT said:
what apps do you class as stock bloatware ? as im going to do the same as you !
Click to expand...
Click to collapse
Me too!
ghenn4 said:
No drain here. With one charge phone now survives two days of intense use.
(stock JVP, dark core kernel, stock bloatware removed, ext4 lagfix)
Click to expand...
Click to collapse
Could you also tell me how i get from Miui 6.1 to your firmwarebuild and which steps i have to follow?
Thanks in advance =)

p34nuTT said:
what apps do you class as stock bloatware ? as im going to do the same as you !
Click to expand...
Click to collapse
Well, it depends on personal preference , but for me bloatware is software that I will never use, or use someting else instead of the preinstalled one, for exaple : layer,mini diary, write and go, thinkfree office, stock audio player, swype, stock gallery app, samsung apps, touchwiz+widgets, live wallpapers,dual clock, etc.
Of course you need root, and titanium backup to remove, or you can delete the apk`s manually with root explorer, just don`t remove crucial stuff. You can search on google, or in the forums for a list of files,that can be safely removed.

Andeby said:
Android System at 18%, Android OS at 4%.
39min on battery and it went down 2% with nothing running, only wifi on, screen off most of the time.
Doesn't look good for me. About to calibrate battery, but just letting you know.
Click to expand...
Click to collapse
I had it also, but after a few hours it stabilized. Give it some time.
Sent from my GT-I9000 using Tapatalk

so thats means on JVP battery life is very good isn't ? because i never heard any complaint on this firmware.

mainmain820000 said:
so thats means on JVP battery life is very good isn't ? because i never heard any complaint on this firmware.
Click to expand...
Click to collapse
For most it is amazing.
For me it has been so-so but I am letting it drain to calibrate now. Maybe it just looks like it's so-so.

How to get a good battery life!

Well I don't no where to start really as I know I will get told off for making a new thread about battery life!
But this is hopefully some help for people out there that are trying to get a decent ROM and kernel to improve your battery life, well mine has really improved since flashing my Samsung GS2 with Lite'ning ROM 6.1 and flashing the kernel with SpeedMOD T-40.
I have spent lots of hours reading forums about battery life, I think I have tried everything known to man about this phone, somethings worked well somethings didn't, I wanted to get a decent battery life with out sacrificing any features I love about my phone!
When I got into rooting, about 2 months ago I was a n00b, but I stuck to it and learnt a lot each day, it's not easy and you can't expect someone to tell you how to do it, you have to read up about it like everyone else!
But anyway back to why I've created a new thread, well after installing Lite'ning ROM 6.1 at the beginning of the week which I really like as it keeps the Samsung software, I've used TB Pro to freeze the Hubs as I don't use them, the battery life wasn't what I thought, in fact I think I got a better battery life with the stock rom unrooted
I did some researching and found that the kernel can make a difference to (I'm still learning) so after reading some forums I learnt that speedmod kernel worked well with Lite'ning ROM, as It was just the kernel that came with the ROM, ninphetamine 2.0.5, so I flashed the kernel last night with Odin and within minutes I was back up and running.
I then charged the phone 100% and then use a battery calibrator app to wipe battery stats, I then did a basic test which I previously did before, I went to sleep with a fully charged phone, I left everything on: WIFI, mobile data network and sync on set my alarm clock and went to sleep (p.s I checked a few websites so battery actually went down to 98%)
8 hours later I woke up checked my phone to see what % it was left one, previously on stock ROM with same set up my phone would be on 65% due to the Android OS bug running high! This time it was on 91%, so that's less than 1% drain an hour! Happy or what!
I know some people might not say this was a actual battery test but to me it is and I can see a big difference, funny thing is the AOS was showin 35% in batt stats, which is strange!
Now as I write this at 1pm my phone has been on for 14hrs and I'm still at 75%, yes I know the first 8 hrs was in standbye, but I've had a lot of notifications come through from G+ this morning and I'm pretty happy with what I have got set up now, without compromise as well!
I will upload a screen shot later if any wants to see when my battery stats when its down to 1% etc
I hope his helps some people out there, but I wanted to keep it simple for some as I was once a n00b (might still be)

Better change your title.. when i first saw it i thought you are asking how to have a good battery life.. just a suggestion
Sent from my GT-I9100 using xda premium

ephraim033 said:
Better change your title.. when i first saw it i thought you are asking how to have a good battery life.. just a suggestion
Sent from my GT-I9100 using xda premium
Click to expand...
Click to collapse
Just done, thanks for that

ephraim033 said:
Better change your title.. when i first saw it i thought you are asking how to have a good battery life.. just a suggestion
Sent from my GT-I9100 using xda premium
Click to expand...
Click to collapse
"Want good battery life!!!" - I believe the OP is ordering the reader to demand better battery life. I agree with the OP. Let's start "Occupy Samsung" movement.

thanks for this thread. i will definitely try it later after some playing around with CM7

@Maverik: Np dude.. glad to help
@Kreo: basing in OP's statement and the last part of it, he is stating how to get a better battery life instead of demanding for it..
Sent from my GT-I9100 using xda premium

Op, do you have auto sync on?

No worries, I thought that if it helped me its going to help more ppl.
What's CM7 like, you trying the stable or the nightly?

chiefroastbeef said:
Op, do you have auto sync on?
Click to expand...
Click to collapse
Yes I do and background data.

ephraim033 said:
@Maverik: Np dude.. glad to help
@Kreo: basing in OP's statement and the last part of it, he is stating how to get a better battery life instead of demanding for it..
Sent from my GT-I9100 using xda premium
Click to expand...
Click to collapse
I'm still relatively new to posting, but thanks again

maverick1103 said:
No worries, I thought that if it helped me its going to help more ppl.
What's CM7 like, you trying the stable or the nightly?
Click to expand...
Click to collapse
I am the stable. its snappy and i liked the different look and feel with other roms that i hv tried such as litening, villain, batista and stock.
Today i installed setcpu and will see how the battery will perform.

norbu23 said:
I am the stable. its snappy and i liked the different look and feel with other roms that i hv tried such as litening, villain, batista and stock.
Today i installed setcpu and will see how the battery will perform.
Click to expand...
Click to collapse
Cool, I did try CM7 but it was a nightley, build 68 I think, if they had brought the stable version out a week earlier I would be on that now, but I hear there are still bugs?
At least with Lite'ning its completely stable plus I like the look of the neon blue effect
My battery is on 64% now, I think I can go 2 days with this now

I'm on CM 7.1 Stable now and now even after 2 days i still have almost 40% battery left out, though on stock i never got more then 1 days

funtoosh said:
I'm on CM 7.1 Stable now and now even after 2 days i still have almost 40% battery left out, though on stock i never got more then 1 days
Click to expand...
Click to collapse
That's not bad, which Kernel are you using, the default one?
I have 5% left and going to screen shot it at 1% to show ppl what they can get, bearing in mind I could get max 12hrs out of it before!
1 day 9 hrs so far brilliant if you ask me!

maverick1103 said:
That's not bad, which Kernel are you using, the default one?
I have 5% left and going to screen shot it at 1% to show ppl what they can get, bearing in mind I could get max 12hrs out of it before!
1 day 9 hrs so far brilliant if you ask me!
Click to expand...
Click to collapse
I first rooted it with superoneclick and it downloaded odin and flashed some insecure kernel first and then rooted it
Then i just installed CM 7.1 with Rom Manager, not sure which kernel is it

if you are gonna try cm7 try the latest nightly build....thats pretty more stable than the "stable" version...i think build 83 is out today and that will have pretty much more bug fixes and i hope they can get that browser lag fixed and thats pretty done deal for me to switch over to that completely

funtoosh said:
I first rooted it with superoneclick and it downloaded odin and flashed some insecure kernel first and then rooted it
Then i just installed CM 7.1 with Rom Manager, not sure which kernel is it
Click to expand...
Click to collapse
If you installed with ROM manager that will be the generic one that comes with it, check in about phone its second from bottom.

Matriak31 said:
if you are gonna try cm7 try the latest nightly build....thats pretty more stable than the "stable" version...i think build 83 is out today and that will have pretty much more bug fixes and i hope they can get that browser lag fixed and thats pretty done deal for me to switch over to that completely
Click to expand...
Click to collapse
I can't keep up with the nightleys plus when I tried build 68 I think it was, camera didn't work at all. Is the latest much better?
Also which Android version is it based on?

Happy!
So as promised here are screen shots of my phone running at 1%, I forgot to screen shot CPU spy as well (sorry) but I can say that with this set up I am really happy, as I cannot remember when with general use I have managed to get over a day with out charging my phone, iPhone 4 included!
If there is a better set up out there with a newer ROM I would be interested as this is based on 2.3.4 tho Google Talk video works so I'm happy

maverick1103 said:
So as promised here are screen shots of my phone running at 1%, I forgot to screen shot CPU spy as well (sorry) but I can say that with this set up I am really happy, as I cannot remember when with general use I have managed to get over a day with out charging my phone, iPhone 4 included!
If there is a better set up out there with a newer ROM I would be interested as this is based on 2.3.4 tho Google Talk video works so I'm happy
Click to expand...
Click to collapse
man that os is very high....but you still managed to get a day out of it so not bad work buddy..
nightly there is a new one coming out today version 83...still few bugs they need to sort out but once that is done il be on there...that firmware is based on 2.3.7.
im using speedmod latest kernel..it does not support bln or bootlogo but i would sacrifice all that for a decent battery life which i am getting....so far 5 and half hours past and im down to 75% and 2hours screen on time....not bad i think

Best rom for battery performance?

I'm using Super Optimized 2.1 rom and battery life is poor - one day. I'm talking aprox 1h per day, few text messages and reading news once in a while. Also i installed about 30 application, and that's it.
I've noticed that people like the new oxygen rom? Is it fast enough and what about battery life? Also, does it come with data2system?
Thank you!

In general 2.1 ROMs are best for battery. maybe you should calibrate it once.
Oxygen ROM won't have better battery life than 2.1 ..
If you want to have much space for apps, try mur4ik bootloader builder. With that u don't need a special d2s version
Sent from my GT540

For me after many rom ,the better for battery is Froyo optimum 5 ,not the 6 because it's not tweaked

I see on 4pda some new 2.1, it's say that it have gr8 battery life... will post link when i get home.
Sent using Tt.

bataya said:
I see on 4pda some new 2.1, it's say that it have gr8 battery life... will post link when i get home.
Sent using Tt.
Click to expand...
Click to collapse
Please do that. Thank you!

Here you go.
http://4pda.ru/forum/index.php?showtopic=247306&st=80
(use google translate to translate to english)

Sorry, wrong link.
Use this
4pda.ru/forum/index.php?showtopic=259783

bataya said:
Sorry, wrong link.
Use this
4pda.ru/forum/index.php?showtopic=259783
Click to expand...
Click to collapse
Did you try it? What about battery life, stability? Is it fast?

No, i did't. I will wait non data2sys version and than i will try it.
Sent using Tt.

I'm using 2.3.7 ASIS by Mur4ik and it also drains battery, but it can last like 2 days with regular usage...texting, music, apps (no games). Also, it's overclocked on min 825MHz/max 825MHz so if it was 250/600 it would probably last longer

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!
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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
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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
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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.