WatchOS 9.1 in Apple Watch Ultra has an additional "Low Power Consumption" setting that allows you tomore
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However, Apple said that getting the full rated 60-hour extended battery life of the Apple Watch Ultra will require "an additional low-power setting that lowers the GPS and heart rate readings," which was not available at launch, but now ships with watchOS 9.1.
Since the first iteration, the Apple Watch has had, according to the company, "all-day battery life," in fact about 18 hours.With watchOS 9, this can be up to 36 hours with Low Power Mode enabled for Series 4-8 watches.