A few days ago when I went to use my iPad after having charged it all night it showed the battery percentage at 97% and would not charge further. After turning it off all the way and then turning it back on I was able to get it to show the charge at 100% where it sat for the rest of the day even with heavy usage. Based upon my experience it should have read something in the 60s.
Later that evening I shut it off again and left it off for 20 minutes. When I turned it back on, it seemed to hang in start up before displaying text on the start up screen that I of course did not get a picture of, but seemed to indicate there were problems loading. I'd say it was on there for just a minute or so before the usual start up screen appeared and then it sat for an unusually long period of time before loading again. From there the battery percentage drained quickly and ended in the 50s. I was able to plug the iPad in that night and the battery charged as normal to 100% and then the usage percentage updated the next couple of days as normal.
This morning it was only at 91% after charging all night and when I unplugged/plugged back in it updated to 100% almost instantly where it has remained all day. My kids have played games, I've checked my email, etc. it should be at least in the 70s at this point based upon my previous experience. I've called Apple support because it is still covered by AppleCare until April. They were...not helpful. I got the spiel about the percentage only being an estimate and then he said something to the effect that he couldn't understand why I was calling. He suggested resetting my iPad without restoring from back up which I have done. There is no change. My iPad still thinks it is fully charged even though it's been in use all day. This isn't an estimate, this is fairy tale land territory. There's just no way that's even remotely accurate.
Is this a hardware issue? Should I make a Genius Bar appointment and drive an hour away to the Apple store to see if they can figure it out?