Use Your GoPro Hero 8 Batteries In Your Hero 9 Black - YouTube
GoPro Hero 9 Battery: How to Put In & Take Out - YouTube
Amazon.com: TOMSHEIR Hero 9/10/11 Battery 3-Pack 2000mAh and USB Storage Fast Charger Fully Compatible with Gopro Hero 9 Gopro Hero 10 Gopro Hero 11 Black Official with High Speed Micro SD Card
Ulanzi G9-6 Battery Door for GoPro 12/11/10/9 – ULANZI