How do I check iPhone 11 battery life after factory reset

If the iPhone was reset back to factory defaults, there is an "hello" screen that appears on the phone.

You will have to go ahead and set up the iPhone again before you will be able to check the battery status.

Settings > Battery > Battery Health & Charging > Maximum Capacity

Go to Settings > Battery, then tap Battery Health & Charging. iPhone displays information about your battery's capacity, peak performance, and whether your ...

Check the iPhone battery health and usage

go to: Settings > Battery > Battery Health