Extended Battery Pack for GoPro HERO4, HERO3+, HERO3 [with Backdoor Ho - Sabrent
See What's Inside the GoPro Hero4 | Time
Amazon.com : SOONSUN Frame Mount Extension for GoPro Hero 4 3+ 3 with Screen / Battery Extension - Use with LCD BacPac or Battery Extension - Includes Quick Release Buckle and Thumb Screw : Electronics
GoPro HERO4 and GoPro AHDBT-401 Battery (2-Pack) by Wasabi Power
Amazon.com : GoPro Battery BacPac (Camera Not Included) (GoPro Official Accessory) : Electronics
Ahdbt-401 1680mah Go Pro Hero Battery | Gopro Hero 4 Batteries Charger - 1680mah - Aliexpress
Amazon.com : GoPro Rechargeable Battery for HERO4 Black/HERO4 Silver (GoPro Official Accessory) : Electronics
GoPro Rechargeable Battery (for HERO4)
Amazon.com : PowerTrust 4-Pack AHDBT-401 AHDBT401 Battery for Gopro Hero 4 AHBBP-401 Digital Battery and AHDBT 401 Dual USB Charger for GoPro Hero4 HERO4 Camera : Electronics
Wasabi Power Extended Battery for HERO4, BTR-ABPAK401-BDOORS B&H
Portable Emergency AA Battery Charger Extender suitable for the GoPro Hero4 / Hero 4 - with Gomadic Brand TipExchange Technology - Walmart.com