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iApplebytes confirms iOS 13.5.1 has a worse battery life, geekbench 5 battery test is a intensive test. On my iPhone 11 i got around 9-10hours of screen on usage and on geekbench
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Battery & Geekbench test on iPhone SE (1st gen) on iOS 13.7, 14.0 (final) & iOS 14.2 Beta 1! - YouTube
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Performance & battery life : Apple iPhone 13 and 13 Pro series review: These are peak iPhones - HardwareZone.com.sg
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