Is this good for a 1 1/2 year old iPhone 6S Plus?(89% battery health) iOS 13.3 : r/ios
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iOS 13.3 improves battery life and performance on older iPhones
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iOS 13.3 improves battery life and performance on older iPhones
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iOS 13 on the iPhone 6S and SE: New software runs fine on a phone that's still fast | Ars Technica
iOS 13 Battery Drain Issues: 10+ Tips to Improve iPhone Battery Life
iOS 13.3 improves battery life and performance on older iPhones
Apple iOS 13.3 Release: Should You Upgrade? [Updated]
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iPhone 6s Battery Drain iOS 13.3 - Apple Community
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