pry the Right ear pad off peel off rubbery ring find and remove 4 Philips screws remove the outer plastic cap the battery is soldered to the circuit board
Just replaced stock SSD on macbook air early 2014 with WD_black 500 GB w/ Sintech NGFF M.2 nVME SSD Adapter Card. Upgraded from Catalina to Big Sur. Followed your instructions. Works. Takes about 20 minutes to replace hardware and less than an hour to install OS from prepared flash drive. Thank you for the instructions!