iFixit posts repair guide for Retina MacBook Pro, estimates battery replacement at $500 - 9to5Mac
Replace a 2012 MacBook Pro Battery in 2020 - Learn Robotics
MacBook Pro 13" Retina Display Late 2012 Battery Replacement | Macbook pro battery, Macbook pro, Macbook
Replace Battery for Apple MacBook Pro 13'' 13 inch A1278 A1322 mid 2009-2012 | eBay
Amazon.com: A1382 Battery for MacBook Pro 15 inch A1286 Early 2011 Late 2011 Mid 2012 New Replacement Laptop Battery (7200mAh 10.95V/78.84Wh 25 Months Warranty) : Electronics
MacBook Pro 13" Retina Display Late 2012 Battery Replacement - iFixit Repair Guide
Recyclers disagree on impact of glued-in Retina MacBook Pro batteries | Ars Technica