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
Samsung-built A9 chip in iPhone 6s found to drain battery faster than TSMC one, Apple doesn't really agree
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Geekbench 4 ios battery scores / Geekbench / Discussion Area - Primate Labs Support
iSpeedtestOS on Twitter: "iOS 15.0.1 lasts in Geekbench 4's battery test 0.18% longer than iOS 15.0 for me. Testing performed on an A9 device, your results may vary. #iOS1501 #iOS15 #Battery https://t.co/frE2ke3xRK" /
Geekbench 4 ios battery scores / Geekbench / Discussion Area - Primate Labs Support