Based on your daily charging routine, it may automatically defer charging to 100% until shortly before you need to use the battery. Optimized Battery Charging is available on all platforms as of iOS 13, watchOS 7, and macOS Big Sur. Optimized Battery Charging and Optimized Charge Limit adapt to your daily usage and preserve your battery lifespan over time.To reduce battery aging, built-in software and hardware systems are included to manage charging patterns and battery temperature. For more power-efficient communication between the devices, keep Bluetooth enabled on iPhone. Disabling Bluetooth on your iPhone increases the battery drain on your Apple Watch.When you want to turn on the display, just tap it or press the Digital Crown. Open Settings on Apple Watch, select General, select Wake Screen, and turn Wake Screen on Wrist Raise off. If you’re very active with your hands and your watch display turns on more than you think it should, you can prevent the display from turning on every time you raise your wrist.To pair the Bluetooth chest strap with your watch, make sure the strap is in pairing mode, then open Settings on Apple Watch, select Bluetooth, and choose from the list of Health Devices. 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:

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