Apple iPhone 5 battery test is complete, find the results inside
iOS 8 Battery: How do Different Devices Perform on Latest OS
iPhone 15 Pro and Pro Max Battery life tests (Source: Geekwan China) | MacRumors Forums
Use Low Power Mode to save battery life on your iPhone or iPad - Apple Support
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