battery health
How to recover battery health to100%?
iPhone 12 Pro Max, iOS 14
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Only by replacing your battery. Batteries degrade over time, and nothing you can do will change that. If it is above 80% then don't worry about it.
If your battery health reduces below 80% in less than one year, then you can get it replaced under warranty. After one year you would need to pay for the replacement.
See https://www.apple.com/batteries/service-and-recycling/