GoPro has revealed an extended battery pack for the Hero 9 Black and the Hero 10 Black. The Enduro battery will deliver up to 40% better battery life than standard GoPro batteries and will be available for US$24.99.
https://www.notebookcheck.net/GoPro-announces-the-Enduro-extended-battery-pack-for-the-Hero-9-Black-and-Hero-10-Black.575696.0.html