You may be experiencing a bad iPhone Battery Health. It is time for A iPhone Battery Replacement.
Do you know that replacing iPhone Batteries are serialised for iPhone 11 and later. Meaning that using non-genuine Apple Parts will cause the system to prompt you with “Unknown Part” error message, indicating that the battery is not recognized by Apple unless going thru Apple Diagnosis System to configure the battery. But not all battery are able to run Configuration with Apple Diagnostics System. Only Genuine Apple Battery From Apple are able to run Apple Diagnostics.
We use Apple Genuine iPhone Battery Sourced Directly From Apple, Using Apple Diagnostics System to perform the repair. iPhone Battery Replacements Done with us, will display “Apple Genuine Parts”