Just recently I've noticed that even after my phone has been on its charger for several hours, the battery level still appears at 80-90%, which it was at when I put the phone on the charger. If I long press the power button to bring up the shutdown dialog, the battery meter immediately jumps to 100%. I thought this might have been because of a battery meter widget I had installed, so froze the widget, but still had the same thing happen today. Is this an early sign of impending doom for my battery? I've had this phone for a year. Thank you.