For longer workouts, you can choose to use a Bluetooth chest strap instead of the built-in heart rate sensor.Note that when the heart rate sensor is off, calorie burn calculations may not be as accurate. To do this, open the Apple Watch app on iPhone, go to My Watch > Workout, and turn on Power Saving Mode. During running and walking workouts, turn on Power Saving Mode to disable the heart rate sensor.There are a few ways you can preserve battery life on your Apple Watch: After it’s removed from storage, it may require 20 minutes of charging with the original adapter before you can use it.
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