All of a sudden, battery won't charge when the phone is on. The light on the side indicating charging will not come on when phone on. when phone off, light is on.
Take out your battery and try again, my charging was acting like that for a while and I was having problems with it showing the actual charge, the battery kept showing it was only like 80% but would shut off charging and so I had to remove the battery like 15 times, each time a different way with the chord still plugged in, and finally it was showing 100% when it really was.
Found out it's bad to remove the battery while plugged in, and turn the screen on to show the M symbol, lol