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
Amazon.com: Temark New A1382 Battery for MacBook Pro 15 inch A1286 (only for Early 2011, Late 2011, Mid 2012), fit MC721LL/A MC723LL/A 661-5844 020-7134-A : Electronics
Amazon.com: A1494 Laptop Battery for MacBook Pro 15 inch Retina A1398 Late 2013 Mid 2014 Early 2015 Version, ME293 ME294 MGXA2 MGXC2 MJLQ2 MJLT2 MJLU2 : Electronics
MacBook Pro 15" Retina Display Mid 2012 Left Fan Replacement - iFixit Repair Guide