So I've run into this issue a couple of times. The first time my percentage showed at 27% and I had been browsing the web for about 10 minutes and it still showed 27%. So I thought "That's odd, it should have dropped by now" another 10-15 minutes goes by and it's still at 27%. I hit the sleep button and go and come back about 15 minutes later and I hit the home button to wake it up and see that it's dropped to 23%. I took it to the genius bar and the guy did a battery diagnostic check and the only thing he could see was that the battery was running fine. 8 1/2 hours of usage with 22% of battery remaining. Nothing he could see wrong. I tried doing a complete restore and then monitored the battery again. It hit 13% and the same thing happened again. The % wouldn't go down until I hit the sleep button. I came back a little later and it showed 8% when I woke it from sleep. And just now, the battery was "stuck" at 2% and I put it to sleep. When I came back to try to wake it up, the battery was dead. I'm trying another complete drain and recharge but, kind of worrisome. Anyone run into the same issue?