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
Genuine GoPro AHDBT-401 3.8V 1160mAh 4.4Wh Battery for GoPro HERO 4 Silver Black | eBay