Charging problem
My phone stops charging at 80%. How to resolve it?
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This is an expected behavior for iPhones using the latest iOS's. The battery is managed to charge at 80% and, depending on your daily usage (i.e. when you start using your phone in the morning), will top off the charge to 100% when it thinks you'll start using your phone for the day.
That being said, you still may want to check your battery health to make sure you battery is still healthy (Settings > Battery > Battery Health).