battery heath
how can I make my battery heath back to a 100% without replacing the battery?
iPhone 13 mini
Question marked as
You can't. Battery Health declines normally and there is no way to reverse battery health decline, except as you suggest other than replacing the battery.
Follow the steps in this support article to do the best things to keep your battery as healthy as it can be, but accept that with every full cycle battery charge, the battery in your iPhone will decline and it will continue to decline until it's time to replace the battery, which is a battery health reading of 80%. As a rule of thumb, one can expect from 1-2% loss in battery health per month.
See this for helpful tips --> Batteries - Maximizing Performance - Apple