3D Printed GoPro Hero 4 Battery Case by s.kennedy | Pinshape
Opteka Rugged 6000mAh Power Bank for GoPro Hero4 with Dual AHDBT-401 Battery Charger and USB 5V-2.1A for Smart Phones, Tablets and Action Cameras - Walmart.com
Action Battery Grip, Red - GoPro® & other Action Cameras | JOBY
Amazon.com: Batmax 3 Packs 1680mAh AHDBT-401 Battery + LED Dual USB Charger with Type C Port for GoPro Hero 4 Black/Silver Action Cameras : Electronics