Amazon.com : Wasabi Power Battery for GoPro HERO4 and GoPro AHDBT-401 (2-Pack) : Electronics
GoPro 2 Genuine Original Rechargeable Battery Pack for HERO4 and GoPro HERO4 Dual Battery Charger for GoPro HD Hero 4 Black Silver AHBBP-401 AHDBT-401 : Electronics
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 : Smatree Battery (3 Pack) and 3-Channel Charger Compatible for Gopro Hero 4 (NOT for Hero 5) : 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
Sabrent Extended Battery Pack for GoPro HERO4, HERO3+, HERO3 [with Backdoor Housings for HERO4 only] (GP-KPHA) | GP-KPHA
Amazon.com : Smatree 1290mAh Replacement Battery Compatible for GoPro Hero4 (Pack of 2) Bundle with 3-Channel Charger and USB Cord : Electronics