iOS 12.4.1 charging issue
since updating my iPhone XR to 12.4.1 it stops charging at 80%. I had no problem with charging on iOS 12.4.0
it doesn’t matter whether I am using use, wireless or mains it always stops dead on 80%
iPhone XR
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See this, If your iPhone, iPad, or iPod touch won't charge - Apple Support
There is a section that addresses charging to 80%.