The newest iPhones always have a raft of fun and useful new features, but they don’t do much good if your phone doesn’t last through the day. That’s why Apple has been adding battery-saving features to iOS for years—and there’s one you should start using. A quick caveat: this feature is currently limited to iPhone 15 models but there’s no reason Apple couldn’t bring it to older iPhones in iOS 18 or an iOS 17 update. If you have
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