Q. help me find the battery KILLER - Galaxy S II Q&A, Help & Troubleshooting

as the title says. I am looking for ways to get my battery to perform like it did before.
I was using villain rom with SPEEDMOD kernel.and I had very good battery life. one night I noticed my battery getting really really hot while charging. then the battery life went down hill. I tried wiping battery stats, removed battery for 5min after full charge, changed to cm based rom(it was even worse). i upgraded my modem to KI4. Now I am in villain rom with SPEEDMOD, (17) kernel and the battery life is still ****.
any suggestions####. yes I could blame Android os bug. its a 2.3.5 rom and I turned off all the sync as well I have absolutely no idea how to solve this issue.
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it is with minimal use. theme is not the culprit as I have tested without theme and got a similar results.
Sent from my GT-I9100 using XDA App
update
I did not want to change the ROM but I gave 'HyperDroid-Androidmeda' a try. to my surprise the battery drain was gone. then i installed ics theme 'the battery was still good'. then I set up google account and restored K9 mail via titanium backup. THEN AGAIN the BATTERY started to deain heavily.i uninstalled K9,but the battery drain had not gone, uninstalled titanium backup no LUCK. still investigating......but i know i am close

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The batteries used in the SGS2 do not need (and therefor not offer) calibration.
Your problem is something else and there is about a million threads about how find'n'fix the issue.
Out of the blue, I'd blame some app you're running.

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HellcatDroid said:
The batteries used in the SGS2 do not need (and therefor not offer) calibration.
Your problem is something else and there is about a million threads about how find'n'fix the issue.
Out of the blue, I'd blame some app you're running.
Click to expand...
Click to collapse
I am aware of all the other threads. I've faced battery life problems before as well but it was usually resolved by flashing a different kernel or rom. you may be right about the rouge application.
Sent from my GT-I9100 using XDA App

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Sent from my GT-I9100 using XDA App

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can anybody help me make sense of what is killing my battery. btw I did ude the audio recording software for an hour and also the circuits app but they are not the culprit. main problem is that the phone does not go to sleep.... and battery drains rapidly.
i for first 50% of charge i was on speed mod kernel ... there was battery drain. and then i flased the rom again, the battery life got worse.
Sent from my GT-I9100 using XDA App

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UPDATE....wifi was preventing my phone from going to sleep(still dont know what the real cause is)..... AFTER several ROMS and a DEAD SD card... my problem seem to be gone...for now at least. i basically flashed official firmware and flashed speedmod for root and clockwork mod. then flashed checkROM with speedmod again. fingers crossed the problem is gone.