Unknown battery (iPhone not charging)
Does anyone has a tip how to fix it?
iPhone 11, iOS 15
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If you had the battery replaced by a non-Apple repair shop, then there is your issue. Apple doesn't sell their batteries so the repair shop put in a non-genuine battery. Take it back and make them fix it or get your money back.
If you didn't get it replaced, then take it to an Apple store and get a new battery installed.