The HD HERO2 camera and the HD HERO Original camera are compatible with the Battery BacPac. 

The HD HERO2 camera will work with the Battery BacPac out of the box. 

A software update is required for the HD HERO Original camera to work with the Battery BacPac.  To update your HD HERO Original camera software, please go to the HD HERO Original Camera Software Update page.

Once you find the LCO/LCF option in your HD HERO Original camera's Settings menu, your camera should work with the Battery BacPac.

Please note that the Battery BacPac is not compatible with the HD HERO 960 camera or the Standard Definition HERO cameras.