ecco come Apple ha calcolato le famose 18 ore
https://www.apple.com/watch/battery.html
Quote:
All-Day Battery Life
Up to 18 hours
Testing conducted by Apple in March 2015 using preproduction Apple Watch and software paired with an iPhone using preproduction software. 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. Battery life varies by use, configuration, and many other factors; actual results will vary.
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