Just to get the whole gift shopping out of the way early, I purchased an iPad2 a couple of weeks ago. It's just sitting on my shelf, unopened. It won't be opened for about another 6 weeks. My question is, will the battery deteriorate if I just leave it there without charge? Should I open it up and put some juice in it? Tricky question; on the one hand I don't want to break the nice clean cellophane wrapping, but I also don't want to damage the battery by non-use... please advise!