When I was walking to the gym I had about 80% battery and I was listening to music using Pandora. I went into the locker room to change and when I left (10 mins later), my iPhone wouldn't turn on or anything. Though it was a stretch, I thought I might have put it into DFU by accident, so I tried the combination to get it out. It didn't. I went home later and plugged my iPhone into a wall charger, and voila. HOWEVER, it begins to charge. I was very worried as I had 80%... I look after about 10 minutes, and I see that my iPhone has loaded and that it read 78%. So far, so good, but I'm just wondering why/how did this happen? Obviously this isn't normal (I've had my iPhone for a good 3 months), but is it something to worry obsessively about? Thanks, let me know about anything! By the way, it's a 16GB iPhone 3G.