Core SWX Battery Eliminator USB with Backdoor DV-GP4-USBC B&H
GoPro - Rechargeable Battery for HERO4 Black / HERO4 Silver - GoPro Accessories - Avvenice
Use your GoPro Hero 4 without your battery. Use a power bank instead of batteries Plus a MAGIC TRICK - YouTube
Kastar 1-Pack Battery and LTD2 USB Charger Replacement for Gopro4 Hero4, AHDBT-401, AHBBP-401 Battery, Gopro HD HERO4 Black & Silver, HD Hero 4 Black & Silver Action Sport Camera - Walmart.com
4Pcs 1680mAh Gopro Hero 4 Battery Replacement + LED 3-Slots USB Charger for GoPro HERO4 GoPro AHDBT-401 Action Camera – Photo Camera Store
GoPro HERO4 and GoPro AHDBT-401 Battery (2-Pack) by Wasabi Power
Amazon.com: Wasabi Power HERO4 Battery (x2) and USB Triple Charger for GoPro AHDBT-401, Hero 4 : Electronics