My battery health reached 97 to 96 in one week only
My my battery health reached 98-96 in one month only
iPhone 11, iOS 14
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Click on this link about 'iPhone Battery and Performance' to read about the battery health feature and what is considered normal performance --> https://support.apple.com/HT208387
For iPhone 11 models read 'About recalibration of battery health reporting in iOS 14.5' [and later]. Click here --> https://support.apple.com/HT212247