“One of the standout features of the OnePlus Watch 3 is its long battery life, which lasts 16 days in power saver mode and 5 days in smart mode. A quick 10-minute charge gives owners a full day of use, so an hour’s charge will likely reset the 16-day (or 5-day) countdown. The 120-hour battery life in smart mode lets you keep Bluetooth and Wi-Fi running, send messages and make calls, use the screen, and track exercises.”
I don’t generally judge a watch by its standby or power save modes, as it often only tells the time and does a few other basics. But 5 days of normal use, and a 10-minute charge giving a day of use, is pretty good (OK my Pebble Watch did last longer).
It is good to see they upped the battery capacity a bit too. For me, battery life is more important than a phone or watch being 1 mm thinner. The battery chemistry has also changed, so clearly battery life was a prime consideration for this design.
To top it all, this watch actually runs Wear OS. Why I say that, is that the Wear OS watches have mostly had dismal battery life compared to the tweaked OS’s from Huawei and others.
This watch will be on my short list to compare when I next need to replace my smartwatch.