Okay so recently [like a week ago], I've notice that my 2nd Gen [8GB] iPod Touch battery has been draining very quickly without me using it. It never did this before and I'm not sure what the problem is. I have no idea if it is still under warranty because my grandfather gave it to me as a Christmas gift. Should I take it to the Apple store and let them look at it? Or is this normal? It is currently running iOS4. Should I update to the current version? Could that be the problem? Any answers would be very appreciated!