"Has your iPhone battery life got worse since the latest update? You're not alone - You might want to hold off on that update..." (Apr 2023):
https://www.imore.com/ios/ios-16/has...oure-not-alone
"iOS 16.4 takes big chunk out of iPhone battery life" (Apr 2023):
https://www.cultofmac.com/811683/ios...-battery-life/
"iOS 16.4 battery drain? Why you should NOT update your iPhone" (Apr 2023):
https://www.laptopmag.com/news/ios-1...te-your-iphone
"Why your iPhone's battery drains faster on iOS 16 and how to fix it" (Jan 2023):
https://www.laptopmag.com/how-to/why...-how-to-fix-it