Don't Buy a New MacBook Air; Replace the Battery Instead
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 | Pricepulse
iFixit: New MacBook Pro has first 'DIY-friendly' battery replacement design since 2012 - 9to5Mac
Battery For Apple Macbook Air 13" A1369 2011 A1466 2012, 2013-2017 A1405 A1496 | eBay
How to Replace MacBook Air Battery (Official/Self): EveryMac.com
Resurrecting a dead MacBook Pro (mid-2012 13-inch, model A1278) | Rip It Apart - Jason's electronics blog-thingy