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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.
When you reach for Appleâs magnetic inductive charger, it should be able to top off your watchâs battery up to 80 percent in 90 minutes, and fully charge it in two-and-a-half hours. Apple also noted that the 42mm Apple Watches generally experiences longer battery life than the 38mm models.