1. Charge the battery pack using the supplied USB cable. 

2. Once charged, the battery pack can be attached to the jacket with the cable in the jacket's inside pocket. 

3. Connect the battery pack to the cable, may sure the cable is aligned with the groove on the pack connector by following the 2 arrows. 

4. Twist the cable cover to lock the connection securely. 

5. Turn the button lights on and off with the button on the hood.