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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.
A music-listening session will last just six-and-a-half hours, according to a product page on Appleâs Web site. But perhaps more importantly for some users, the Apple Watchâs health-monitoring mode drains the battery in just seven hours. The battery-life figures were given for the smaller, 38 mm model of the Apple Watch, which has a smaller battery. Figures werenât given for the larger, 42 mm model.