Seems strange, I know. I plugged my iPhone in last night before going to sleep, it got the "battery charging" indicator, but when I woke up, it was only at 80% and still "charging". I felt it and it was warm to the touch. Turned it off, plugged it in, and turned it back on. Came back on with 99% charge. 5 minutes later, it was back down to 80% and kind of warm. Is my phone toast?