I had to go out of the country for three weeks, and, for security reasons, decided to leave my iPad at home. I was concerned about the battery draining while I was gone. Well, surprise, surprise! I turned the iPad off completely when I left, and came home yesterday to find the Battery still at 100%, after three weeks. It hadn't drained a bit. Just a note for those of you who may someday have to do the same thing I did, without worrying about battery longevity.