Charging via Micro-USB

The initial charge (recommended before 1st use) will take 8-10 hours. During the charge, your battery should display a red LED. The LED will turn off when the battery is fully charged. 

Charging via Fast Charger

Full charge takes 2-2.5 hours. During the charge, the Fast Charger will display a red LED. When the battery is fully charged, the LED will turn green. 

Battery LED Key
Red - Charging
None - Fully charged

Fast Charger Key
Amber - Idle (no battery docked)
Red - Charging
Green - Fully Charged