When I leave my phone off the charger overnight pre-jb, it still shows 100% or 99%. After jb, its showing 93%. Also when I did light surfing, it seems to drain more. Also something weird happened. It was at 88% battery life when I put it on the charger. After 10 minutes, I took it off and it was still at 88%. I restarted the phone and now its showing 90%.