76 minutes at maximum resolution, 148 minutes at Full HD. On average, the GoPro Hero9 Black lasts over 40 per cent longer. However, the charging time has increased by 35 minutes to 129 minutes. An external charger therefore seems mandatory in order not to block the camera for more than two hours due to the charging process. However, if you are not going to be in the water, you can operate the camera with a power bank if you do not have spare batteries.