I have turned off all sorts of things in settings (IOS 9.0.2) and still I can watch my battery drain. Just writing this post it went down 1%. My iPad 2 hardly ever had to be charged in a couple of days. I'm lucky if I don't have to charge my iPad Air 2 several times a day. Both iPads have essentially the same apps on it. I'm at a loss and very disappointed. (My iPod 5 also drains miserably). No marked improvements in battery life on any of these devices since IOS 9.