1 Disable the Heart Rate Sensor (Maybe)
The heart rate monitor is an important part of the Apple Watch’s health and fitness suite. But it does use up battery life. Weigh your options.
If you decide that you can do without, you can disable it in the iOS Watch app.
- Just go to Privacy.
- Motion & Fitness.
Apple also has a built-in battery life-saving feature called Workout Power Saving Mode. Switching this on (in Settings > General) will disable the heart rate monitor, as well as cellular connectivity when you’re running or walking. Of course, heart rate monitoring is an important health feature, so take some thought to see if it’s really the kind of thing you want to disable.