How do I change my battery to percentage?

If you are using an iPhone that has Face ID, you cannot display the percentage rather than the battery icon. But you can see your battery percentage in a few different ways.

1. from the lock screen
2. by dragging downward by the battery icon on your home screen (control center)
3. swipe right on your home screen and view your widgets. If battery is not one of them, you can add it by scrolling to the bottom, selecting 'edit' and adding the Battery widget

Just my 2 cents:

4) asking: "Hey Siri, what’s the level percentage of my battery?"

Giulio

Thanks! I don't use Siri for much so I did not think of that

My pleasure, Chris.

It was just to inform the OP of another (further) option :)

Keep well

Giulio