My iPhone's battery health is not showing

Hi sanni117,

We appreciate you reaching out to us.

We’d like to gather additional details that may help us be in a better position to assist you.

Have you had the chance to restart your device? Restart your iPhone - Apple Support

If you haven't, please check for a software update and make sure that you are running the latest version of iOS.

While it isn't inherently assured that an update will resolve the issue, updating to the latest software version for your device can help isolate potential software issues. 

Kindly secure a backup and update.

How to back up your iPhone, iPad, and iPod touch - Apple Support

Update your iPhone or iPad - Apple Support

If your device is already up to date, we recommend that you get your device inspected by a technician.

You can explore your service options here: Get Support

Take care!