Product Details - GoPro Original Battery BacPac
The Battery BacPac works as both a charger for your spare HD HERO & HD HERO2 batteries and plugs into the back of both camera models to nearly double record times. Perfect for long duration time-lapse photo sessions, endurance motorsports racing or any application where you need up to 2X* the battery life.
Product Specifications - GoPro Original Battery BacPac
1 Battery BacPac1 Li-Ion Battery1 Waterproof Door for HD HERO Housing1 Skeleton Door for HD HERO Housing1 USB CableWarranty: One Year
Size - GoPro Original Battery BacPac