Does the GoPro Hero 4 work with Hero 2 Battery Bacpac? - YouTube
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Amazon.com : GoPro Battery BacPac (Camera Not Included) (GoPro Official Accessory) : Electronics
Amazon.com : GoPro Battery BacPac (Camera Not Included) (GoPro Official Accessory) : Electronics
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GoPro Battery BacPac for HERO2, HERO3, HERO3+, and HERO4