So I've had an old battery problem pop back up on my iPhone 3GS. This happened a few months ago, quit, and now is happening again. My battery will drain rather quickly, like quicker than it seems it should. In reality, its literally dropping like 5-10% instantly, although I rarely see it happening. When I plug it in to charge it, it will instantly jump back up that percentage, anywhere from 5-20% sometimes. It did this before, and then suddenly fixed itself. I've had it go to 20% or whatever, and I get the warning that battery is low, etc., so this isn't a indicator calibration problem I don't think. It seems to be legitimately losing battery life. I have not checked with an Apple store on this as the closest one is about three hours away. I was wondering if anyone else has had this problem, and if they've had their phone replaced by Apple, or came up with another solution. Please let me know. Thanks in advance.