If you have a problem with your camera's audio after using the Battery BacPac, it's likely that you haven't successfully updated your camera's software to be able to function with the Battery BacPac.

Once you find the LCO/LCF settings on your camera, you know that the camera software is properly installed and it will be ready to function with the Battery BacPac.  Please check out the Updating the Software in the HD HERO Original Camera page for instructions on how to update your camera's software.