[Galaxy S II General] m444266:
First and foremost, I would like to commend all developers, software engineers, modders, tweakers, designers that contributes to the betterment of our devices. GREAT JOB to ALL of you! Keep it up! Respect and Thanks to all!

There are so many ROMs out there that we can pair with so many KERNELs while we can choose to apply different MODEMs. Whether they be Stock or Custom, one thing remains important to us is our SGS2's BATTERY LIFE.

With so many people saying different things about the battery life.. this rom/kernel ate,doubled,f'd,saved my battery, while this modem somehow gave me more juice than that one.. so i'm sticking to this/that one.. Its all getting confusing and complicated. Problem is that different people's apps/usage/definition_of_usage varies.

So here I performed benchmarks to compare battery life as I try to make other things constant. Hopefully this is a start and others would also help me here.

[CONDITIONS_01]

Modem: xxKH3

Brightness: highest

Battery: original & calibrated

Wifi ON

phone signal ON

Home screen with pure WHITE background, no other widgets.

Always ON. Awake. No screen time out

CPU clock and/or voltage: kernel's default (no OC/UV on my part)

Left it at the home screen 95-99% of the time.

juice defender free

[RESULTS] 100% until power off [updated: 09/07/2011]

Build: Lite'ning rom v6.0 xxKH1

7) SpeedMod s2 k1 T27 : 5h 41m

3) Jeffrey_SpeedFrey2.2.0 : 5h 19m

6) (stock)GT-I9100_XXKH1_original : 5h 6m (yes, the one used to remove the yellow triangle)

10) RageMod v2 T27 : 4h 58m

9) Lulz Build 14 : 4h 54m

12) JameBond Galaga 1.9.2.2 : 4h 53m

4) Jeffrey_SpeedFrey3.0.0 : 4h 33m

5) Ninphetamine 2.1.1 : 4h 31m

2) SpeedMod s2 k1 T26 : 4h 24m

1) Ninphetamine 2.0.5 : 2h 58m | 8) 2nd pass: 3h 47m

11) Ninphetamine 2.0.2

'-- w/ WHITE bg : 3h 24m

'-- w/ BLACK bg : 11h 26m (+236% more)

Build: Lite'ning rom v6.1 xxKH3

Ninphetamine 2.0.2 : 4h 33m | 4h 50m ~ 4h 41m average

SpeedMod T31 : 4h 24m | 4h 57m ~ 4h 41m average

SpeedMod T32 : 5h 3m | 4h 49m ~ 4h 56m average

RageMod v1 T27 : 4h 57m | 4h 56m ~ 4h 56m average

RageMod v2 T27

'--no UV: 4h 44m | 4h 41m ~ 4h 42m average

'--UV'ed: 4h 57m | 4h 55m ~ 4h 56m average (800mV on 200MHz..using setCPU)

[COMING SOON]

Ninphetamine 2.1.?

SpeedMod T3?

RageMod v1/2/? T27

:: MORE BENCHMARK :: Thank you very much for your efforts ot help! :D:D For the readers, the test environment beyond this post would be different. Please view their post for more info such as methods, environment, etc.

View pileot 's benchmark environment

- Build: DarkyROM2 XXKH3 Base R2

Result: KERNEL

SuperCore 1.7 : 1h 21m View post

Ninphetamine 2.1.2 : 1h 27m View post

RageMod v1 T27: 1h 25m View post

SpeedMod T27: 1h 33m View post

View abhi021 's benchmark environment

- Build: Lite'ning Rom v 6.1

Result: KERNEL

Ninphetamine 2.0.2 : 6h 20m = 41% left View post

SpeedMod T27 : 6h 20m = 44% left View post

RageMod v2 T27 : 6h 20m = 53% left View post

Ninphetamine 2.1.2 : 6h 20m = 56% left View post

Let the result do most of the talking. however that doesn't mean that a certain kernel is better. battery-wise, yes. but feature-wise I am not sure. Also, I have confirmed to myself the the biggest battery consumer is the DISPLAY!. Keep the whitebackgound up and charging via usb couldn't catch up. at least in my case.

I hope someone using other ROMs(VR, Cognition, Sensation,etc) could also share similar benchmarks.

My Tips when doing a similar benchmark.

- get a toggle to always ON ur phone. will never sleep and will not lock the screen. I used Widgetsoid.

- Don't play games. but if you really want to, play the same game on the same level/stage with the same duration of playtime.

- You can watch a movie. BUT, watch the same movie for each test.

- your device might be more app efficient than mine, doesn't matter. compare by percentage.

- target: linear slope in graph. would entail constant usage.

- use "Stablity Test" app to drain batt faster.. word of caution tho, this means your CPU will be running max speed. let your cpu rest after tests.

THANK YOU! I hope we get more info and results..