How much is it to replace battery on iPad Pro model mlyr2ll/a
How much is it to replace the battery on my iPad pro
Apple do not replace iPad batteries. Instead, for qualifying devices, Apple of a rapid exchange service - where your iPad is exchanged for a reconditioned iPad of the same model and specification as your existing iPad.
If your iPad is otherwise undamaged and fully functional, the cost from Apple is typically the local currency equivalent of $99 USD + Tax.
Additional detail can be found here:
iPad Repair - Official Apple Support
