iphone 11 battery percentage

That option is not available for an iPhone 11. See the following from Show the battery percentage on your iPhone or iPad - Apple Support

iPhone XR, iPhone 11, iPhone 12 mini, and iPhone 13 mini don't display battery percentage in the status bar.

samedcant wrote:

i am using ios 16 but i cant use battery percentage uptade

Read here Show the battery percentage on your iPhone or iPad - Apple Support