How much can it cost to replace the battery of a MacBook Pro?

• Mac Service and Repair - Official Apple Support

https://support.apple.com/mac/repair/service

Out-of-warranty 'battery service cost' after AppleCare is cited.

• Apple Repair and Repair Status Check - Apple Support

https://support.apple.com/repair

Depending on your region or country the price would

vary due to exchange rate, tax, fees, parts and labor.

Perhaps to contact [ Get Support ] could be more useful?

Here you can get the base values Mac Repair - Official Apple Support

Once you take it to an Apple Store or Authorized for a proper check you'll be given the real cost, OK?