MacBook Pro 17" Unibody Battery Replacement - iFixit Repair Guide
Replace your 2009-2012 MacBook Pro HD with an SSD
Battery For Apple MacBook Pro 13 inch A1278 A1322 Mid 2009 2010 Early 2011-2012 712155998278 | eBay
Amazon.com: Easy&Fine Replacement A1322 Laptop Battery for MacBook Pro 13 inch A1278 Battery (2012 2011 2010 2009 Version) MB990LL/A MB991ll/A MC374ll/A MC375LL/A MC700ll/A MD101LL/A MD102LL/ MacBook pro Mid 2012 : 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