Amazon.com : GoPro Rechargeable Battery for HERO4 Black/HERO4 Silver (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 : GoPro Rechargeable Battery for HERO4 Black/HERO4 Silver (GoPro Official Accessory) : Electronics