Battery life ... to 36 hours (on Series 10) and up to 72 hours on Apple Watch Ultra. It’s able to work on any Apple smartwatch running watchOS 9 or later meaning Series 4 and newer.

Apple Watch Series 4, on the other hand, always sits on its charger before I go to bed simply because battery drainage happens more frequently when I use the fitness apps. Fitness has always been ...

both the Apple Watch SE and Series 10 smartwatches can last up to 18 hours on full battery, with the latter stretching this number up to 36 hours when in the Low Power Mode. While the Apple Watch ...