I'm currently using an iPhone 13 from late 2021, so almost 4 years old. It's showing 79% Maximum Capacity in Battery Health, and I only occasionally use more th

I'm currently using an iPhone 13 from late 2021, so almost 4 years old. It's showing 79% Maximum Capacity in Battery Health, and I only occasionally use more then 75% of battery over a days use. I still have the iPhone XR I upgraded from, so a 7 year old 2018 phone, that still holds a whole day's charge too (but doesn't get much use, and doesn't have a SIM in it right now so I'd guess it's powered down the cellular radios?) I have an iPod Touch from a bit before Covid, so 6 years old from 2019-ish - it stopped getting daily use when Covid and WFH hit, so it's battery is old, but still in reasonable condition. (Pity newer iOS won't run on it...)