Why doesn't iphone xr display the law of battery efficiency after changing batteries?

Apple's mobile phone does not show battery health after changing batteries because it has changed unofficial batteries.

If a non-original battery is used, the system can detect it. It is recommended to replace the official battery at an officially authorized maintenance point.

If there is no problem that the mobile phone cannot be charged and consumes too much power, then you don't need to replace the battery of the mobile phone and you can continue to use it.

However, if the maximum capacity and peak performance of the battery are not detected, it means that the battery may have the possibility of frequency reduction.

This is why Apple's mobile phone does not display the content of battery health after changing the battery. I hope it helps you.