Battery health
My iPhone XR is only 7-8 months old but its battery health decreased to 90 % What do I do for it??
iPhone XR, iOS 14
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That value is related to when its battery (not the iPhone) was new.
That said, read these support articles:--> iPhone Battery and Performance - Apple Support
and/or this:--> https://www.apple.com/batteries/maximizing-performance/
Then see also these useful suggestions:--> https://discussions.apple.com/docs/DOC-9732
Regards
Giulio