"This iphone is unable to determine battery health"what does it mean?
What does it mean?
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This might mean that the battery replacement may not be installed properly or the battery that was installed on your iPhone is not genuine. You may want to set an appointment for a battery check at the nearest Apple Service Centre or see the list of Apple phone numbers assigned to your region here https://support.apple.com/en-us/HT201232 to contact Apple Support.
To learn more about batteries on iPhone https://support.apple.com/en-us/HT210323
I hope this helps. Have a great day!