My battery life is terrible since updating. In fact, this week alone, phone has been totally dead when I get up in the morning on 3 separate times. I charge during the day. I have shut down most things that use up battery when idle, never leave programs running in the background, and still can't figure it out. I had charged it from down to 20% for two hours and it was at 72% when I went to bed and completely dead the next morning. I have the iphone5 and have since October. If it doesn't it again , I will be going to the apple store as it isn't very dependable as an alarm and had the iphone4 for two years before that. However, the battery life on the 4 decreased a lot when I updated it to 6.01.
The problem w/ that is... it doesn't give an accurate account of usage. Yesterday afternoon your phone could have been at 10%, you plugged it in up to 95%, then took a screen shot @ 4%. So, in theory, what we'd be looking at here would be the usage of a 176% charge cycle. The only true and accurage accounts of usage is when you fully charge to 100%, don't plug it in anymore, then screen shot whenever you're getting low.