Amazon.com : PowerTrust 3Pcs AHDBT-401 Battery for Gopro Hero 4 AHDBT401 AHBBP-401 AHDBT 401 Digital Battery and LED 3-Port USB Charger for GoPro Hero4 HERO4 Camera : Electronics
GoPro - Rechargeable Battery for HERO4 Black / HERO4 Silver - GoPro Accessories - Avvenice
GoPro Hero4 Dual Battery Charger
Core SWX Battery Eliminator USB for GoPro HERO4 (10 ft)
Amazon.com: Wasabi Power HERO4 Battery (x2) and USB Triple Charger for GoPro AHDBT-401, Hero 4 : Electronics