iPhone XS Max Battery Maximum Capacity not showing after update ios 15.1

[Saw Chit]

I've bought a used Xs Max last week with the battery maximum capacity of 100% but after upgrading ios 14.8 to 15.1 the battery maximum not showing. I've already done Erase all content and settings and Reset All setting but the battery capacity still not showing. When I connect with PC the Battery Life is showing 100% in 3uTools software. What should I do?

Many Thanks!

 

[now i see it]

It’s a non-Apple replacement battery that hasn’t been blessed by iOS 15. As far as I know, there’s nothing you can do about it. Only Apple batteries play nice with the battery health app.

 

[Saw Chit]

Thank you very much for your information.

How about this information from 3uTools? Is it reliable? All Serial Numbers are correct.