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.