[kirstein]

Chances are you since you seem to be running a stock rom, something you installed keeps running non-stop and killing your battery. I'd start by uninstalling everything you can live without. If that doesn't help, do a clear memory, (be aware that will totally erase your phone and it will be just like it was when it was new. You will lose all your data if it isn't backed up somewhere.)

If the battery usage gets better, add things back one by one until the problems come back.