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
New Apple iOS 13 is KILLING batteries as iPhone owners find battery life drains quickly | Daily Mail Online
iOS 13.3.1 - Follow Up - Battery, Performance and more - YouTube