[tzs]

Many people get more than 3/4 day. For the Series 10 that 18 hours of battery is based on 300 time checks, 90 notifications, 15 minutes of using apps, and a 60-minute workout with music playback from the watch via Bluetooth. For watches without cellular it also assumes 18 hours of Bluetooth connection to a phone. For watches with cellular it assumes 14 hours of Bluetooth connection to a phone and 4 hours of LTE cellular connection.

I've got mine set to charge to 80%, and over 23.5 hours it typically falls to somewhere in the 30-40% range. I put it on the charger for 30 minutes when I sit on my couch in the evening to watch Jeopardy! and do the NYT crossword puzzle. That's plenty of time to get it back to 80%.

I do have the always on display turned off, so the display only comes on when I turn the watch to look at it or tap or click. Always on display would take more power but my recollection from before turning it off is that it would still easily make it 23.5 hours starting from 80%. With a 20 W charger it can go from 0 to 80% in 30 minutes, so that would still be done by the time I finished Jeopardy and the crossword.

(I didn't turn off always on display to save battery. I turned it off because I didn't really find it useful. When I'm not actively checking the watch I almost hold it in a position where I don't really have a good look at the display, and moving it so I can get a good look almost always would be enough to turn it on in "raise to wake" mode).