Database Users

UPDATED:Which KERNEL is the best that won't drain a lot your GS2 battery?

As far as I concerned, there are plenty kernels for GS2: KE2, KE7, KE8, KF1, KF2, KF3, KF4, KG1.
But after I flashed the [2.3.4] VillainROM 2.0 for SGS2, I tried two different kernel, they are KG1 and KF2. But I found out KF2 works way better, it can last about 8 more hours than KG1. The kernels are from
http://forum.xda-developers.com/showthread.php?t=1103399
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I did full wipe before I flash the ROM. I use Odin3 v1.85 flash the kernel in the download mode and works perfectly.
SO, the only difference is battery life.
UPDATED:
This morning's screen:
Around 3% drop after 7h.
Not really remarkable, but I guess KF2 is better.
What do you guys suggest?
Please, tell me which kernel you are using, the Rom and the battery life.
Screen shot is WELCOME!
Cheers!

kernel
That sounds unlikely. I didnt test it yet but i will test it. Atm i have KG1.

a question a bit off-topic: Can I flash an stock kernel of a different ROM to my current ROM?
For example:
I'm using the KF3 spanish ROM (2.3.3). Can I flash only the kernel of KG1 (2.3.4) to my ROM?

I have KF2 for a while now, I'm very happy with it.
Did a test a few days back, went to sleep and put the phone in airplane mode, battery was 87%.
When I woke up (8.5 hours later) battery was 85%.
A 2% drop in 8.5 hours, not bad.

While i have no evidence, I too believe this to be true, when i first got the phone I was on KF2, lasted ages, now it struggles for 10 hours. I don't fully understand the android OS so i just do as the ROM devs tell me.

Bit more complicated than just a kernal is battery drain .
Firmware modem apps running all can play a part .
jje

I am using litening ROM 2.1 with KG1 kernel for a few days now and I think battery was better on KF2 so I switching back to KF2. I participate in the poll when I am sure which gives more battery life.

Off-topic: I have lost count about the number of updates that Samsung released in different parts of the world. But sure that there were atleast couple of updates for every region.
Once the GS2 is released in US (if at all it's released there), there will be 1 update in 12 months and there will be countless articles in every blog. Somehow updates just don't roll out in US.

KF3 Kernel KE7 modem Villain 1.4 rom no battery complaints .
Once 2.3.4 becomes a full release i shall try that .
jje

Could you post your screen capture of the battery usage, either of the kernels would be fine. If you can post both of them, I will be really appreciate that.
I will post my screen tomorrow.
Sent from my GT-I9100 using XDA App

I don't think a kernel has too much to do on battery life. But Push email exchanges, Active Sync and some apps. Use ATK, problem solved.

I'm using Lite'ning 2.1, bloatware removed, sync on - I take my phone off charge at 8.30am, it's normally on my desk not being used for around 3 hours and unless I start using it, the batt has never dropped below 100%.
I'd like to leave it longer to see just how long it will stand by for on 100% but I want to use me phone!

diablous said:
While i have no evidence, I too believe this to be true, when i first got the phone I was on KF2, lasted ages, now it struggles for 10 hours. I don't fully understand the android OS so i just do as the ROM devs tell me.
Click to expand...
Click to collapse
I am having trouble with the batter at the moment. I am using villainrom 2.0 with KF2 now, using xda app for about 25min and my 13% is gone. Last night, I am using KG1, I turned the phone into the flight mode, after 9h, the battery drained from 98% to 26%. That was really strange. I have nearly 150 apps installed, most of them are small simple apps like for finance, business, social networking, tools, not much background running apps.
I wish someone can explain to me.
Sent from my GT-I9100 using XDA App

While the Android OS bug still reigns supreme, stock KG1's battery life is unparalled for me, as long as I keep WiFi off. With WiFi on, Android OS is always higher than 50% and the battery life is crap, but it has always been like that on all kernel versions up to now.

aydc said:
While the Android OS bug still reigns supreme, stock KG1's battery life is unparalled for me.
Click to expand...
Click to collapse
Are you using 2.3.4 stock rom?
Sent from my GT-I9100 using XDA App

liuwenaz said:
Are you using 2.3.4 stock rom?
Click to expand...
Click to collapse
Yep.. I just froze some Samsung crap like Social Hub with Titanium Backup and added a percentage battery indicator with UOT Kitchen. Other than that it's all stock.

aydc said:
While the Android OS bug still reigns supreme, stock KG1's battery life is unparalled for me, as long as I keep WiFi off. With WiFi on, Android OS is always higher than 50% and the battery life is crap, but it has always been like that on all kernel versions up to now.
Click to expand...
Click to collapse
Wifi on Battery dropped 13% in 21 hours .
Android OS 24%
KF3 Kernel KE7 modem Villain 1.4 rom
jje

JJEgan said:
Wifi on Battery dropped 13% in 21 hours .
Android OS 24%
Click to expand...
Click to collapse
The bug that I'm suffering from only kicks in with certain routers like mine.
I lose 25% in 6,5 hours with WiFi on and the phone left completely idle. Thank you Samsung. Great coding...

Sounds like the wifi sharing bug! Fixed in version KE7 upwards. What version are you using?

ithehappy said:
I don't think a kernel has too much to do on battery life. But Push email exchanges, Active Sync and some apps. Use ATK, problem solved.
Click to expand...
Click to collapse
I use ATK all the time, I don't have Push email exchanges, I only have Google Account Sync and whatsapp sync in the background.
I also use autorun manager which prevents some services restarting.

2.3.5 Kernel BATTERY NOT GOOD

I've installed the 2.3.5 kernel recently because people were saying it was great on the battery but i'm getting pretty tired of this...
Out of nowhere sometimes like this morning i left the phone screen off since 7.00 am full charge and i checked it now at 11.40 and the battery was at 79%... It has been awake the whole morning. I looked at OS monitor and it might be calendar trying to sync all this time without having a 3g connection or wi-fi... why would it keep the phone awake and try so many times to sync if i'm not under 3g coverage?
I used to get 3 days with 2.3.4. I'm going to revert back. Aweful update...

thanks for telling us

I thought it was calendare but apparently it isn't.
Only after clearing RAM has it stopped staying awake even with screen off.
No idea what this is all about.
How do i discover what's keeping my sgs2 awake?

Tell me about it!
I flashed XWKI8 and I have been having all sort of issues with it. My phone was terribly slow and very laggy. It was getting seriously heated up around camera.
And above all, I took it off the charger (100% battery) 7:30 in the morning and now by 3:30 PM I got no juice left in the battery! It just died upon me.
I think I will flash it back to our trusty KF3 update.
Does anyone know if I can just download it from Intratech's thread and update with ODIN, or do I need to get some kinda wipe package from somewhere?

i'm quite positive you just need to reflash the pda in odin

You have no idea what you are talking about. You start that the kernel is not good. Then you blame the calendar for keeping your phone awake. Now tell me how is that related?
You can't say that something is bad based on one experience.

If you read the replies you would've seen that calendar is not the problem...
And before the update the phone was NEVER awake if the screen wasn't on... So YES i think it's a kernel problem

Nonsense !
2.3.5 battery just fine ... better than 2.3.4
Gives me a full day when used intensive (3-4 hours of surf, mail, talk)
Gives me 2 days if used moderately
About ½% per hour standby

The real question now is... how can i see what is keeping my phone awake???

Riqz said:
The real question now is... how can i see what is keeping my phone awake???
Click to expand...
Click to collapse
Search for 'Better Battery Stats' in XDA.
Besides, I don't think it's huge improvement in battery life in 2.3.5 than 2.3.3. I am getting almost same battery backup in recent KI3 which I was getting in previous 2.3.3 KF3. There are plenty of ROM's but I doubt there is any difference between then other than they are dedicated for different regions. It's basically a freaking thing to flash new ROM's continuously.

look at this thread http://forum.xda-developers.com/showthread.php?t=1290020
and check if it isn't the same thing that's bothering you. when you look at the built in battery stats, do you have a very high usage percentage of "Android OS"?

dude I am usin XXKI8 (2.3.5) with chain-fire root kernel KI8..
I have seen drastic improvement on battery life over KF3.. only 2% overnight drain on standby (with data connection off of course). smoother animations.. near zero lag while locking, unlocking, smoother browser.. the only thing that bothers me is occasional lag while opening gallery.. rest is superb..

Seylox said:
look at this thread http://forum.xda-developers.com/showthread.php?t=1290020
and check if it isn't the same thing that's bothering you. when you look at the built in battery stats, do you have a very high usage percentage of "Android OS"?
Click to expand...
Click to collapse
AOS Issue doesnt seem to be affecting me i think:
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HOLY SHOIT!!!
I think i've found the culprit:
How do i get rid of this? I thought facebook android app was decent!!! It wasn't 2.3.5 at all!!!

Riqz said:
HOLY SHOIT!!!
I think i've found the culprit:
How do i get rid of this? I thought facebook android app was decent!!! It wasn't 2.3.5 at all!!!
Click to expand...
Click to collapse
I had that also, it's a ***** in Facebook app. You don't need to remove facebook app, just go to facebook chat and log off. I wonder why it's enable by default from facebook if they know this thing is going to drain battery like hell.

Riqz said:
HOLY SHOIT!!!
I think i've found the culprit:
How do i get rid of this? I thought facebook android app was decent!!! It wasn't 2.3.5 at all!!!
Click to expand...
Click to collapse
How?
Very simple : just delete it.
Your battery will thank you soon, and you will certainly stop pulling your hair out.
Anyway, you always can use mobile FB version which is actually pretty good.
Cheers

No need to delete, just use the app and sign out of chat, poor design on part of facebook, but like many others using android, no investigation, just blame the update or the phone......

nah. i did not know how to see what processes were keeping my phone awake. now that i know i'm a happy new man. And i'd also like to change the title of this thread!

battery life

Just thought I'd give a quick review of Cyanogen Mod 7 battery life and performance.
Standby battery drain of about 1.5%/hr with 3G, backround data on, auto-sync on, wifi on, GPS on.
I've never obtained such great battery life on any stock rom or stock-modified rom (I've tried a few different ones over the last year or so)
The performance is also much better than any of the stock-based roms (no lags).

No need to create new topic for that information.

fan/zombie boys everywhere
aple has ones so why not android ;]

Which nightly are you using? Which kernel?

After a night my Galaxy S is always dead. I solved the problem disabling 3g connection and sync. Stock rom 2.3.3 and semaphore kernel.

nqwi said:
Just thought I'd give a quick review of Cyanogen Mod 7 battery life and performance.
Standby battery drain of about 1.5%/hr with 3G, backround data on, auto-sync on, wifi on, GPS on.
I've never obtained such great battery life on any stock rom or stock-modified rom (I've tried a few different ones over the last year or so)
The performance is also much better than any of the stock-based roms (no lags).
Click to expand...
Click to collapse
Sorry to say but useless thread. Just keep the damn charger always near you and battery life wont matter.
Btw did cyanogen pay you for posting this?or........

haha I had the same thought

I used to always hear about CM7 having god-awful battery life. I don't know if people were lying or if they fixed some major bugs, but I certainly have no complaints about my phone's battery life (running CM7, of course). I get through way more than a day.
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That's my current battery stats. Haven't used the phone too much the last little while, but getting over 24 hours is not uncommon—I actually very rarely see my phone last for under 24 hours, and that's usually because of 5+ hours of screen on time. For that battery, I'd say about 75 texts, 30 minutes of phone calls, and about 30-60 minutes of web browsing. Fairly light use, but nevertheless, the battery life on CM7 is nothing to complain about.
EDIT: Looks like something was causing a wakelock the last ~6-8 hours while I was asleep, causing my phone not to deep sleep. If that hadn't of happened, it would still have quite a bit more battery (when I went to bed it was 44%, so it shouldn't have dropped to 27%—it should have dropped to ~40%). This just proves my point even more: battery life on CM7 is not bad at all.

seriusly?
do you see any battery change in that period compared to one earlier ))
when it was awake on your funny screenshot it was discharging with the same when the phone was not awake acordding to that stats so no impact registered

Thanks to share that information...

Which app did you use for the graph... battery life

anuj_blaster said:
Which app did you use for the graph... battery life
Click to expand...
Click to collapse
The graphics is shown in the ROM itself... you just need to touch the small graph and that one will appear...
Menu>Settings>About Phone>Battery and that's it...

Best battery life that I've seen, using cm7.1 stable.
Currently at 2 days 1hr 15 mins with 14% remaining.
Wipes the floor with friends phones on stock roms charging every night. I only switched toCM7 after darkyrom barely lasting 12 hours at times

NI3K said:
Best battery life that I've seen, using cm7.1 stable.
Currently at 2 days 1hr 15 mins with 14% remaining.
Wipes the floor with friends phones on stock roms charging every night. I only switched toCM7 after darkyrom barely lasting 12 hours at times
Click to expand...
Click to collapse
This sounds fantastic, Cm7.1 is my next choice, on XXJVT battery life is only 12h

thats using juicedefender to activate the data connection when screen turns on, emails still push to phone straight away with gmail so it is fine for me.
WIFI seems to drain the battery a bit quicker but not enough for me to bother flashing different kernels

I saw someone who did 2 WEEKS without charging. Normal using with black wallpaper on 2g network.

seems to be even better on ics... the best i had was ~2% per 8 hours...

3G + WiFi + email max 1 day

Battery issues

Getting a bit fed with battery and thought I would see if anyone has any brainwaves on here, or whether my usage sounds about right.
I've been a bit stupid this morning and actually USED my phone. Been on battery for 38m. In car for 20mins with bluetooth connected, quick 2 min phone call. about half a dozen texts sent and facebook status updated with friendstream.
display = 54%
bluetooth = 11%
voice = 8%
wifi = 5% - although not connecting
android sys = 5%
dialer = 5%
android os = 3%
Idle = 3%
MessageCS = 2%
handscent SMS = 2%
Calendar 2%
Battery currently sat on 78% and regretting not bringing charger with me.
My missus Desire S in comparison, noticed last weekend on Saturday she was on 95% left. Asked when she last charged it and apparently it was Thursday!!! I lose 5% in 5mins if I try and do anything. She can sit there all night playing solitaire and use hardly any battery, mine would be dead if I tried the same.
So frustrating. Great phone just such bad bad battery unless just something on mine.

You can search in the DHD developpemnt thread there is some tips to get great battery

Would that be rooted though?

Yeah You Have To Root Your Phone

I rooted my phone, installed LeeDroid HD V5.1.1, still i just got 8 hours on the battery till it dropped to 10% .. i had an always ON EDGE connection with a few calls. Any suggestions?

You Should calibrate Your battery
install current widget from Market and battery calibration
once installed put on a screen the current widget and charge your phone and wait till the widget shows U 0ma then open battery calibration and calibrate your phone then unplug. try it the if the problem stills the same tell me

Just had quick look and I see there are 2 battery calibration apps, one by Nema and one by Professionals.
Which one are you suggesting?

the one for Nema

ah installed and says has to be rooted

Please charge your battery to 100%, boot your device in ClockworkMod Recovery and go to Advanced ---> Wipe Battery Stats.

ok does this mean needs to be rooted again?

Just did a Wipe battery stat and is waiting to see a diffrence.

th3stinger said:
Just did a Wipe battery stat and is waiting to see a diffrence.
Click to expand...
Click to collapse
Ok hope you get better results.

Yes, to calibrate battery you have to be rooted
@Desire HD & CyanogenMod

ghalyoum said:
You Should calibrate Your battery
install current widget from Market and battery calibration
once installed put on a screen the current widget and charge your phone and wait till the widget shows U 0ma then open battery calibration and calibrate your phone then unplug. try it the if the problem stills the same tell me
Click to expand...
Click to collapse
Calibrated the battery by this method but i don't see any notable difference in the battery life.
Sent from my HTC Desire HD A9191 using Tapatalk

It not always necessarily calibrating issue... You could try out different ROM or Radios...
I have seen good battery life with RCMix Blue energized edition... While sleep it gives you amazingly low battery drain.

found.pra said:
It not always necessarily calibrating issue... You could try out different ROM or Radios...
I have seen good battery life with RCMix Blue energized edition... While sleep it gives you amazingly low battery drain.
Click to expand...
Click to collapse
Flashing radios involves a bit more risk I've read?
I checked on the terminal emulator, my ril does not match my radio.. can i flash the matching ril? Is the risk less as compared to flashing a new radio?
Sent from my HTC Desire HD A9191 using Tapatalk

abh1nav said:
Flashing radios involves a bit more risk I've read?
I checked on the terminal emulator, my ril does not match my radio.. can i flash the matching ril? Is the risk less as compared to flashing a new radio?
Sent from my HTC Desire HD A9191 using Tapatalk
Click to expand...
Click to collapse
Just be careful, follow the instruction as explained in threads... I have done it a few times... They even say flashing is risky but that can't stop me, doing it in every 2-3 days.
Or you can go for AOSP ROM...

Pull the battery after shutting off the phone and then go do something else for a minute or two, put the battery back in.
I'd also advise getting better battery stats to check for partial wakelocks.

ghalyoum said:
You Should calibrate Your battery
install current widget from Market and battery calibration
once installed put on a screen the current widget and charge your phone and wait till the widget shows U 0ma then open battery calibration and calibrate your phone then unplug. try it the if the problem stills the same tell me
Click to expand...
Click to collapse
donkyshot said:
Please charge your battery to 100%, boot your device in ClockworkMod Recovery and go to Advanced ---> Wipe Battery Stats.
Click to expand...
Click to collapse
The rumour about battery calibration and battery stats wipe is false.
Here is a post on google plus from an official Andriod dev about battery calibration and wipes.
https://plus.google.com/105051985738280261832/posts/FV3LVtdVxPT
th3stinger said:
Just did a Wipe battery stat and is waiting to see a diffrence.
Click to expand...
Click to collapse
I'm sorry to say but you're wasting your time and effort. Root your DHD, surely its not still under warranty. With a root install an AOSP rom and run Juice Defender from market. Best thing id did.
Proof of concept.
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As you can see it's a lot better than your battery life, sense is a battery killer. Rooting your DHD is the best thing you'll do to help your battery

The "all of the sudden" battery fix on ICS

I have been using my s2 only 1 day on GB so i cant really tell you was the battery life good or bad there, but i i have some news for ICS
stock ROM users.
I was actually really depressed by the ICS battery life (i upgraded from GB same day i bought brand new S2), battery life was terrible,
turning on/off syncing, mobile data, gps etc etc helped a bit, but not that much. i still couldent get full day out of it with moderate use.
Again, im on stock 4.0.3 atm.
And then, a miracle.
Let me say right away, i am aware that these types of batterys (i have stock one btw) dont react on this whole "fully discharge then recharge" thing, but i do think now Android ICS as a system does! Cuz it was exactly what i did-i said what the heck doesent hurt to try and i was playing games like crazy when battery was on 10 or less percent so it wld shut down. then, i connected charger and used as normal on charger until it was fully juiced. repeated 3-4 times and what do you know... i now get 50% OR MORE WITH THE SAME BATTERY!
I am not really sure what happend there. Did battery gauge reset? Did ICS "learned" my battery properly? I dont know. All i know is that i am now able to get trough whole day (i get up 7:00AM, go to sleep round 01:00) with only 1 full charge. I dont even bother turning off wifi sometimes when i go out and dont need it.
I have been also reading around the web that some people got the same result. No calibration trys,pulling battery etc etc...just let it go trough few cycles and let system/phone "calibrate by itself".
Not exactly sure if this is a solution, bug, feature or whatever. I just thought it was worth writing to you guys
cheers, loop

why dont u share some screenshots

np mate, but in evening or tomo morning when i come home

Well, you actually shortened your battery life span by draining your battery to nothing, you should probably google what happens when you drain lithium batteries, and how it affects capacity, and not just
dont react on this whole "fully discharge then recharge" thing
Click to expand...
Click to collapse
You probably did reset your fuel gauge as your phone had no power to hold the gage memory, but you could of saved yourself a lot of battery capacity, by using search and finding out how to reset the battery gauge on the Samsung galaxy s2. Hint* search extweaks and Siyah kernel.
Anyway at least other people who read this, hopefully learn and do it all the easiest and battery efficient way and not
I have been also reading around the web that some people got the same result. No calibration trys,pulling battery etc etc...just let it go trough few cycles and let system/phone "calibrate by itself".
Click to expand...
Click to collapse
Hope this helped, and for future reference do not drain lithium batteries, whether it is your phone, laptop, ps3 controller. Try not to get it under 50% for the best efficiency, but the more you drain it to minimum charge the faster it degrades.

Did you uninstall anything? Did you change any settings? Sounds to me like wakelocks that were removed more than ICS "learning" your battery.

Take it like this: i upgraded to ICS over GB and did full wipe. First day i installed lets say 20+ apps that i use. mostly utilities,few games.
In this period of "recovery" i only updated few apps, installed GTAIII and Flipboard.
Let me make this perfeclty clear as i stated in OP and as deniso wrote: i am aware of todays batterys and how do they work. i am not senior android user but i know my way around,so as i stated, i know i dident "FIX" the battery itself. But i still think the main problem here is not the battery itself,its how ICS uses it.
However this:
Try not to get it under 50% for the best efficiency
Click to expand...
Click to collapse
is just... funny. "try not to" ok i get it, but below 50% is when u need your phone the most, should i carry a portable generator with me? no offense.
Please, do not throw rocks at me. I am aware what i wrote, and i am aware that it doesent makes sense with todays batterys and smartphones.
however,i still do have my better battery life, whatever u say or dont say.
Ill make some screenies when i come home.
Ty all for your feedback.

I said TRY not to, I personally use my phone all day and my battery only gets down to about 75% -85% at the end of the day, so it takes nothing special for our phones, unless you do heavy gaming or movie watching all the time.
And what I said, which wasn't throwing rocks at you, is that you probably just reset your fuel gauge as there was a lack of power to the memory chip, and like I said in my first post, Search EXTWEAKS and Siyah kernel as they have that exact function in them which does not require you to drain your battery below critical values or at all.

hello again, just posting screenies that i promised
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(its in croatian,but you can see what is important)
So as i said before. This is roughly really 50% MORE then what i was getting first few days on ICS. now, i dont know still if this is very good or average, but
it gets me trough day for sure. As u can see, i posted "screen on" time, cuz i was not getting even half of that before and i still have 34% left!
The day was filled with 5-6 emails, i watched 4 youtube videos, did cca 29 mins on surfing and cca 30-35mins in plants vs zombies. few sms, few calls.
So, im not playin smart here or anything, i just have more batter with whatever i did, and it makes me happy
Cheers

You getting more battery after 3 days could quite simply be due to the fact that you flashed new firmware and it always takes a few days for the kernel and modem to 'settle in'. You will never get a true indication of battery drain straight after flashing firmware.
And to the guy above who said he can use his phone the whole day and it never falls below 75%, wow!
I would love to know what firmware, kernel/modem combo you're using.
Sent from my GT-I9100 using xda app-developers app