My i phone 11 bettrey health not showing in my mobile

Did you buy your phone used, or have had the battery replaced?

See:

About genuine iPhone batteries - Apple Support

If you see this message, the battery in your iPhone cannot be verified, and reported battery health information isn't available. This might be due to the installation of a battery that is not a new, genuine battery. This message applies to iPhone XS, iPhone XS Max, iPhone XR, and later.

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