6cells 7070mah A1382 Battery For Macbook Pro 15 Inch A1286 (only For Early 2011, Late 2011, Mid 2012),mc721ll/a Mc723ll - Laptop Batteries - AliExpress
Awesome Battery Life - The 2013 MacBook Air Review (11-inch)
Amazon.com: RayHom A1466 Laptop Replacement Battery for MacBook Air 13 inch A1466 (Mid 2012,Mid 2013,Early 2014, Early 2015,2017) A1369(Late 2010,Mid 2011 Version) High Performance 7200mAh fits A1496 A1405 A1377 : Electronics
Batteries for MacBook Pro 15" Unibody 2011 - 2012 Models
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
Amazon.com: NinjaBatt A1322 A1278 Battery for Apple MacBook Pro 13" [2009 2010 2011 2012 Years] - High Capacity [63.5Wh/10.95v] : Electronics
MacBook Pro 13" Unibody Early 2011 Battery Replacement - iFixit Repair Guide
Battery Life - The MacBook Pro Review (13 & 15-inch): 2011 Brings Sandy Bridge
MacBook Pro 15" Unibody Early 2011 Battery Replacement - iFixit Repair Guide