Just thought I'd chime in here, I too had problems with battery, and I tried resetting all my settings, etc, but the thing that has been the most effective to get my original battery performance is turning off location services. Since I've done this, I've turned a few of the necessary ones on, and since then the battery life has greatly improved. 8 minutes of usage and 4 hours of standby and it was still at 100%. This is on 4.2.1 though. I'm upgrading now.