How to fix unverified battery health and frequent shutdowns on iPhone 11?

sumaira68 wrote:

My iphone 11 battery health suddenlygot unverified and its going shut down again and again and again on what should I do now?

Are you the original owner of the phone? Was the battery at any time replaced by anyone? If the battery has never been replaced, it could be failing, which wouldn't unusual in a phone which was released in 2019.

also do you remember the Health % the last time it was visible?