A rather strange move was made by Apple, as it decided to exclude users who choose to replace their battery with one non-official Apple battery and even worse those who choose to do the replacement on one third party store.
ΠIn particular, those who replace the iPhone XS, XS Max and XR battery in a store other than the company's official repair department will receive a warning message informing them that the iPhone can not confirm if the battery is genuine. or not and will no longer provide "battery health" information to the user.
Of course, this does not mean that iPhones that have their batteries replaced in a third party store will not work properly, but users will not be able to check if their batteries need to be replaced or not.
According to The Art of Repair, this message is caused by a microcontroller in the battery. The controller provides information to the system such as temperature, capacity, remaining full charge time and at the same time is used as a way to certify the battery.
The certification is done through the logic board of the iPhone. So if this microcontroller is missing then the message will immediately appear on the user's screen.
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