Amazon.com : GoPro Battery BacPac (Camera Not Included) (GoPro Official Accessory) : 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
Amazon.com : Suptig Replacement Waterproof Case Protective Housing for GoPro Hero 4, Hero 3+, Hero3 Outside Sport Camera for Underwater Use - Water Resistant up to 147ft (45m) : Electronics
Amazon.com : Switronix DVGP4USB GoPro 4 Battery Eliminator USB Power Cable, 10-Feet (Black) : Electronics