How to charge the battery:
1. Unscrew the battery from the coil head.
2. Screw the battery into the charger.
3. Plug the charger into the socket or into a USB port.
4. The LED will turn from red to green once the battery is full.
The powerful 1100mAh battery (strongest one on the market!) will last up to 10 to 14 hours for average under heavy use.