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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.
Charge times are from 0% to 80% and from 0% to 100% using the included MagSafe inductive charger. Charge time varies with environmental factors; actual results will vary. Apple Watch battery performance claims are based on test results from the 38mm Apple Watch.