Do you use it for workouts, especially for longer periods everyday? I’m a constant Apple Watch user and workout everyday, but I do find the battery life lacking when I’m out on hikes for a few hours. My watch is only a few years old and is supported for watchOS upgrades.
My guess is that the sensors use a lot of energy (even when the display is normally off) and that the longer one uses it for workouts within a day (with the sensors continuously on [1]) and the older the watch is, the lower the battery life.
[1]: there is a setting to in the workout app to reduce the frequency of GPS and heart rate readings during walking, running and hiking workouts when low power mode is also turned on
My guess is that the sensors use a lot of energy (even when the display is normally off) and that the longer one uses it for workouts within a day (with the sensors continuously on [1]) and the older the watch is, the lower the battery life.
[1]: there is a setting to in the workout app to reduce the frequency of GPS and heart rate readings during walking, running and hiking workouts when low power mode is also turned on