MacBook Air 4,2 13-inch (Mid-2011) specifications and other info
MacBook Air review (mid 2011) | Engadget
Amazon.com: Puredick A1406 A1465 Battery, Replacement Battery for MacBook Air 11 inch (2012-2015 A1465) and (Mid 2011 A1370) - A1406 A1495 Battery for 11-inch MacBook Air [7.3V/35W/4790mAh] : Electronics
Amazon.com: A1405 A1466 Laptop Battery for MacBook Air 13 inch A1466(Mid 2012, Mid 2013, Early 2014, Early 2015, 2017) A1369(Late 2010, Mid 2011 Version) fits A1496 A1377 [EMC :2925, 2469, 2559, 2392, 2632, 3178] : Electronics
Apple 13" MacBook Air (Mid 2011) 1.7 GHz Core i5 MC965LL/A - Specifications - SellYourMac.com
MacBook Air 13" Mid 2011 Teardown - iFixit
Review Apple MacBook Air 13 Mid 2011 (1.7 GHz, 256 GB SSD) Subnotebook - NotebookCheck.net Reviews
MacBook Air review (mid 2011) | Engadget
Apple MacBook Air (mid 2011) review
Amazon.com: NinjaBatt Battery A1465 A1370 for Apple MacBook Air 11" [Mid 2011 2012 2013 Early 2014 2015 2016 2017 Years] A1495 A1406 - High Performance [5100mAh/39Wh/7.6V] : Electronics
MacBook Air (11-inch, Mid 2011) - Technical Specifications