Amazon.com : Kastar 3-Pack 3.85V 1900mAh Battery and LTD2 USB Charger Compatible with GoPro HERO9 Hero 9, GoPro ADDBD-001 Battery, GoPro HERO9 Black Edition, GoPro Hero 9 Black Edition, Go Pro 9
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How to change the battery on your GoPro Hero 9 and Hero 10 - YouTube