It’s cost free or no

To get your iPhone 11 Pro battery replaced by Apple, it would cost around $89.

If you have an Apple Care+ plan, then you can replace it for free.

If your battery isn’t worn down from normal use (e.g. defective battery), then you can get it replaced for free (as long as it is still under its warranty).

Refer to this link for for info:

iPhone Repair & Service - Apple Support

Apple recommends replacing your iPhone battery when it has less than 80% max capacity (Settings > Battery > Battery Health & Charging > Maximum Capacity).

Hope this helps!

Not free, unless the Battery Health / Maximum Capacity has dropped to 80% or lower.....and.....you still have AppleCare in effect for the phone.

Otherwise, $89 U.S. at the Apple Store or authorized Apple Service shop.

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