Originally Posted by matttye
Go into Android OS/Android System (most common culprits) and check the "stay awake" stats for those. If they're high, you have wakelock issues.
My Android OS used to stay "stay awake" was 4 hours+ before the update after a day's usage, now it's like 12 minutes.
After that you can download better battery stats to see which wakelocks are causing problems.
Cheers. My Android OS stay awake is 1m 51s and my Android System stay awake is 20 secs - so that all looks OK!