MacBook Pro 15" Retina Top Case w/ Battery (Mid 2012 - Early 2013) - 661-6532
Amazon.com: iFixit A1398 A1618 Battery for MacBook Pro 15" Retina (Mid 2015) - Repair Kit : Electronics
A1398 Battery 15 inch MacBook Pro Retina 2012 2013 2014 A1494 DIY Parts replacement Batteries
13-inch Retina MacBook Pro Review (Late 2012)
NewerTech® : Batteries : NuPower® Battery for MacBook Pro 15" Retina mid 2012 to early 2013 Models
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: 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
Battery for Macbook Pro Retina 15" A1398 Mid 2012 Early 2013 A1417 95WH 9354134022331 | eBay
Amazon.com: Temark A1417 Laptop Battery Compatible with MacBook Pro 15 inch Retina A1398 (Mid 2012 Early 2013), fits for MC975LL/A MC976LL/A ME664LL/A ME665LL/A (8800mAh) : Electronics
MacBook Pro 15" Retina Display Mid 2012 Teardown - iFixit
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