If your device isn't working properly, you can try several solutions to solve the problem. In most cases you can solve the problem by following these guidelines:
The device isn't performing optimally
Cause 1 of 7: The battery is flat
For your device to function optimally, the battery must be charged. To
extend the battery life, it's recommended that you charge the battery before it
runs flat and that you don't fully charge it (e.g. overnight).