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
iOS 16 vs iOS 15 Battery Life DRAIN Test - iPhone 8 Plus vs XR vs XS Max vs SE 2020 vs 11 vs 11 Pro - YouTube
iOS 16.4 Battery DRAIN TEST - XS vs XS Max / 11 / 11 Pro Max / 12 Pro / 12 Pro Max,13 Pro,13 Pro Max - YouTube
iPhone 15 Plus, not iPhone 15 Pro Max, shatters battery life records, beats earlier iPhones too | Mobile News
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iOS 9 Battery Tests Reveal No Major Improvements
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Apple iPhone 14 Plus review: Our lab tests - display, battery life, charging, speakers
iPhone 6s/6s Plus battery test results only | MacRumors Forums
iPhone 15 Plus takes the crown in battery life test, beating all previous iPhone models - 9to5Mac
iOS 17 Update brings battery life problems to some old iPhones