What's the deal with the battery on the 4S? I had the phone plugged into a wall outlet all night (was at 25% prior to going to bed) and I woke up to find it only 91% full. I thought maybe it wasn't showing accurate so I restarted the phone and now it showed 93%. Plugged it back in for about 2 minutes and it jumped to 97%. What's going on Apple? Is it really not charging correctly or is it just not displaying the charge correctly?