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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.
An attendee tries out an Apple Watch following an Apple event in San Francisco, California March 9, 2015.REUTERS/Robert Galbraith. Apple says the watch will be able to last for 18 hours on a single charge, which varies depending on how you use it. That means youâll have to charge it every night. Battery life was a big concern for Apple. Initial reports suggested it wouldnât be able to make it through a day, which would be troublesome.