Apple does not list battery capacities for the new Apple Watch Series 9 and Ultra 2 models, but MacRumors has discovered this information in a...

Apple Watch Series 9 (41mm) 282 mAh Apple Watch Series 8 (41mm) 282 mAh Apple Watch Series 9 (45mm) 308 mAh Apple Watch Series 8 (45mm) 308 mAh Apple Watch Ultra 2 564 mAh Apple Watch Ultra 542 mAh