Amazon.com: A1417 Battery Only for (Mid 2012 & Early 2013) A1398 MacBook Pro - Replacement Battery for A1398 MacBook Pro 15-inch Retina (Mid 2012, Early 2013 Version) - EMC 2512 or 2673 [11.26V/99Wh] : Electronics
A1417 95WH Battery for Macbook Pro Retina 15" A1398 Mid 2012 Early 201
A1417 battery for Apple MacBook Pro 15 inch A1398 (Mid 2012 - Early 2013)
A1437 A1425 Battery For MacBook Pro 13 inch Battery Retina Late 2012 Early 2013 | eBay
Purchase a MacBook Pro 13-inch (Late 2012 - Early 2013) Replacement Battery (A1437) | mac of all trades
iFixit posts repair guide for Retina MacBook Pro, estimates battery replacement at $500 - 9to5Mac