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The GOPRO HERO 3 BATTERY BACPAC is an auxiliary lithium-ion battery pack to extend the battery life of GoPro HERO action cameras.
GOPRO HERO 3 BATTERY BACPAC attaches externally, mounting flush with the back of the camera. A Type B Mini USB port on the BacPac means it can be recharged using any GoPro USB charger.
A computer, or just about any other type of USB charger. It features Backdoors for the Standard and Skeleton housings to accommodate the extra space the BacPac takes up.