GoPro HERO4, AHDBT-401, AHBBP-401 Battery (4-Pack) by Wasabi Power
GoPro Hero 4 4K Digital Action Camera
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