Amazon.com : GoPro Rechargeable Battery for HERO4 Black/HERO4 Silver (GoPro Official Accessory) : Electronics
Amazon.com : GoPro Battery BacPac (Camera Not Included) (GoPro Official Accessory) : Electronics
Brunton All Day 2.0 Extended Battery Pack for GoPro Hero, Hero 3+, Hero 4 - ASD
1680mah Gopro Hero 4 Battery Replacement Bateria + Led 3-slots Usb Charger For Go Pro Hero4 Ahdbt-401 Action Camera Accessories - Digital Batteries - AliExpress