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How to use Low Power Mode on the Apple Watch
The watchOS 9 feature can help an older Apple Watch eke along.
In 2022, the company introduced a new Low Power Mode when it launched the Ultra, and now, it has extended the time between charges for Apple Watches using watchOS 9 and later. On the Apple Watch, Low Power Mode disables the always-on display and limits sensor readings like background heart rate and blood oxygen monitoring. In any case, assuming your Apple Watch is equipped with compatible software, you can enable the feature in two ways.
Or read this on The Verge