Is there a Battery replacement iPhone 11
Why my
Battery dies on new iPhone 11
iPhone 11, iOS 16
Apple discontinued the iPhone 11 about a year ago, so it is unlikely that your phone is "new". If it is, it has been sitting in a warehouse somewhere for a year.
What is the current Maximum Capacity of the battery?
Settings > Battery > Battery Health & Charging > Maximum Capacity
In addition, you need to check the warranty status of your phone..........
Check Your Service and Support Coverage - Apple Support
What are the results when you run this check?