Plug the charger into the AC adapter (5V output) with USB socket or the computer or the x-box one console, the indication light will be on means that the power is put through.
Please use the battery energy up then recharge the battery pack in order to prolong the battery life. and the initiate charge time should be over 8 hours.
Caution:
Forbid to throw it into the water and splash water.
Forbid to throw it into fire or put in beside the high temperature condition.