Amazon.com : Switronix DVGP4USB GoPro 4 Battery Eliminator USB Power Cable, 10-Feet (Black) : Electronics
5200mah Power Bank 30m Waterproof External Battery Bank For Gopro Hero 10/9/8/7/6/5/4/3+/3 Yi 4k Sjcam Action Camera Accessories - Sports & Action Video Cameras Accessories - AliExpress
GoPro Hero4 Session Teardown - iFixit
Amazon.com : Suptig 5200mAh Waterproof Power Bank for GoPro Hero 11 Hero 10 Hero 9 Hero 8 Hero 7 Hero 6 Hero 5 Hero 4 Hero 3+ Hero 4 Session Hero 5 Session and Digital Camera and Smartphone : Electronics
GoPro Rechargeable Battery (for HERO4)
GoPro Hero4 Session Teardown - iFixit
Amazon.com : GoPro Rechargeable Battery for HERO4 Black/HERO4 Silver (GoPro Official Accessory) : Electronics