3 common iPhone battery problems and how to fix them

Is your iPhone slowing down with age? Or, in the case of its battery life, speeding up? One of the first signs of age on an iPhone is the battery not holding a charge as long as it once did. Of course, you might also experience odd battery behavior on a relatively new iPhone, where the battery conks out before the meter hits zero.
Here are three common battery problems — short battery life, shutting off unexpectedly, getting warm while charging — and how to fix them.
My battery dies