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PSA: Some GoPro Hero4s May Get Dangerously Hot when Attached to a Battery BacPac | PetaPixel
Amazon.com : Waterproof BacPac Back Door Case Compatible with GoPro BacPac LCD Screen/Expansion Extended Battery BacPac, for GoPro Hero 4/3+ Original Standard Waterproof Housing Case : Electronics
Amazon.com : SOONSUN Side Open Skeleton Housing Case for GoPro Hero 4 Black, Hero 4 Silver, Hero 3+, Hero 3 Cameras with LCD Touch Backdoor and Skeleton BacPac Backdoor for Extended Battery
GoPro Battery Bacpac - Force-E Scuba Centers
GoPro Battery BacPac for HERO2, HERO3, HERO3+, and HERO4