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All-day battery life is based on 18 hours with the following use: 90 time checks, 90 notifications, 45 minutes of app use, and a 30-minute workout with music playback from Apple Watch via Bluetooth, over the course of 18 hours.
If your battery gets too low, Apple Watch automatically switches into Power Reserve mode so you can continue to see the time for up to 72 hours. Testing conducted by Apple in March 2015 using preproduction Apple Watch and software with 4 time checks (4 seconds each) per hour. Battery life varies by use, configuration, and many other factors; actual results will vary.â. You should be able to get 18 hours of battery from your Apple Watch. According to Appleâs tests, that includes 90 time checks, 90 notifications, 45 minutes of app use, a 30-minute work with music playback from Apple Watch via Bluetooth.