I have an iPhone 13 Pro and an iPhone 13 Pro Max, and after getting them both on launch day, I realized the battery life kinda sucked! Especially bad on the iPhone 13 Pro with its atrocious standby time (and it is even bad in airplane mode, around 8% drain overnight doing nothing). IPadOS 15 and iOS 15 actually made battery better for my iPhone SE 2020 and my 2021 M1 iPad Pro 12.9
So after going to the build number, I saw that both my iphone 13 phones has iOS 15 (19A344) and (19A345) preloaded on the device
A quick 450MB update later, both phones are now on iOS 15 (19A346) and all my battery issues are gone!!!
Currently testing the newly released iOS 15.0.1 for cattery drains, will report back if I find problems
So after going to the build number, I saw that both my iphone 13 phones has iOS 15 (19A344) and (19A345) preloaded on the device
A quick 450MB update later, both phones are now on iOS 15 (19A346) and all my battery issues are gone!!!
Currently testing the newly released iOS 15.0.1 for cattery drains, will report back if I find problems