The GoPro Battery BacPac is a removable battery pack that can be easily attached to your GoPro camera to increases its battery life. The bacPac is extremely useful in situations where changing and swapping battery is difficult. The GoPro Battery BacPac can be charged using standard USB charger. It can also be charged with a GoPro Auto, Wall Charger, or even your computer. It has LCD window and LED light that display the battery level and recording status. It is compatible with the standard housing using the BacPac backdoor, which is included in the kit.