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
Replacing the Battery in a MacBook Pro Unibody (2009-2012) in 5 Minutes! - YouTube
Amazon.com: CSEXCEL New Laptop Replacement Battery for Mac Book Pro 13" A1322 A1278 (Mid 2009, Mid 2010, Early and Late 2011, Mid 2012 Version) Grade A Cell,10.95V 6000mAh/65.5 Wh : Electronics