How to keep my iPhone 7 Plus battery in good health?
I to make my battery go health
[Re-Titled by Moderator]
iPhone 7 Plus, iOS 15
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Apple has a special article about that:
Batteries - Maximizing Performance - Apple
If your battery health shows 80% or less, you will have to get the battery replaced by Apple or an Authorized Apple Service Provider. These are the only places where you can get genuine iPhone batteries.
iPhone Battery Repair & Replacement - Apple Support
The battery health can't be restored, since the battery life degrades over time and use.