OK, so my wife has a new iPad. It's cool, but she lets the battery get low, and then it goes into a 'beeping' frenzy. It beeps, and beeps, and beeps, until the battery gets above a certain level (20% ?). Is there any way to modify this behavior? I can't seem to find anything in the iOS controls, and found posts on the web that seem to indicate it is not changeable. Anyone have a solution?