A hidden setting is being hailed as a game-changer on social media, as millions of users are just now discovering it improves battery life - although Apple released it last year.Called 'Optimized Battery Charging,' the feature is designed to reduce the wear on your battery and improve its lifespan by reducing the time your smartphone spends fully charged. Apple says it delays charging an iPhone past 80 percent, using machine learning to learn your daily routine so that Optimized Battery Charging is activated at the right time.
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