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
MacBook Pro (Retina, Mid 2012) Battery Replacement - YouTube
Replacing the Battery in a MacBook Pro Unibody (2009-2012) in 5 Minutes! - YouTube
MacBook Pro (Retina, 15-inch, Mid 2012) - Technical Specifications
MacBook Pro 15" Retina (Mid 2012) Replacement Battery - Ausbatteries
UPPER CASE (US ENGLISH) FOR MACBOOK PRO RETINA 15" A1398 (MID 2012-EARLY 2013) - Apple Force
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
Apple Has Fully Restored Inventory of Mid 2012 and Early 2013 MacBook Pro Batteries - MacRumors