First up is a new Low Power Mode. When activated, it can significantly improve your battery life from the usual 18 hours. On the Apple Watch Series 8 and Series 7, you'll be able to use the watch for up to 36 hours with an iPhone present. It will also extend the time for older watches before needing a charge. To extend the battery life, it will disable or limit select sensors and features including the Always-On display, heart health notifications, and others. And you'll be able to select from a host of new watch faces including Lunar, Playtime, Metropolitan, and a revamped Astronomy.

https://appadvice.com/post/watchos-9-lands-with-new-watch-faces-low-power-mode-and-more/774671

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