The Battery BacPac seamlessly attaches to the back of your GoPro to increase battery life. It's perfect for long-duration Time Lapse photo sessions, endurance motorsports racing or any application where you need extended battery life. You can charge it using the GoPro Auto or Wall Charger, other USB charger or a computer (sold separately). Features: - Compatibility: HERO3+, HERO3, HD HERO 2. - Seamlessly attaches to the back of your GoPro to increase battery life. - Ideal for long-duration Time Lapse photo sessions, endurance motorsports racing or any application where you need extended battery life. - LCD window displays battery level or charging status. - LED light displays recording status. - Can be charged using the GoPro Auto or Wall Charger, other USB charger or a computer.