MacBook Air Real World Battery Life (Mid-2011): EveryMac.com
Apple MacBook Air review (13-inch, mid 2011) - The Verge
How To Calibrate a Mac Laptop's Power System - NewerTech
Amazon.com: Bovekeey A1406 Battery A1370 Mid 2011 MacBook Air 11" A1465, 35Wh 7.3V for Apple MacBook Air 11" Mid 2011 2012 2013 Early 2014 2015 A1406 A1495, 020-7376-A 020-7377-A (Note: NOT for A1370 2010) : Electronics
Amazon.com: Replacement Battery for MacBook Air 13 inch A1466 (Mid 2012, Mid 2013, Early 2014, Early 2015,2017) A1369(Late 2010, Mid 2011) 7200mAh Laptop Battery for Apple MacBook Air A1496 A1377 A1405 Battery : Electronics
How to Change Macbook Air Battery? Macbook Battery Replacement - YouTube
How To: Replace the Battery in a Macbook Pro 13" Unibody - YouTube
Amazon.com: iFixit Battery Compatible with MacBook Air 11" (Mid 2011-Early 2015) : Electronics