Battery health not show

shahzeb ~ What model of iPhone is it?...

Settings > General > About > Model Name

And what version of iOS is it running?...

Settings > General > About > iOS Version

õ¿õ¬

You should be able to see your Battery Health here: Settings → Battery → Battery Health & Charging

If you have had your battery replaced with a new one that is not a genuine Apple battery, you will not be able to see Battery Health.

You can find more information here:

About genuine iPhone batteries - Apple Support