I feel like my battery isn't up to par on my new ipad air. When I got my launch ipad 1, one thing I noticed was that it seemed to take forever for the battery to drain. On this, the first thing I noticed was that it seemed like it was draining faster. I just unplugged from having it charge all night and have been doing very light browsing, the brightness is at about 25%. Usage shows 25 minutes of use and I'm already at 95%. Should I exchange it?