Follow This Guide to replace the battery.

Note: If your replacement battery has a thin plastic film, do not remove it. This film is glued on and Serves to protect the battery pack while inside the MacBook 

Step 1

Battery replacement

Before you begin, power down your MacBook. Close the display and place it on a soft surface with the top side facing down.

Using a P5 Pentalobe driver, remove the ten screws securing the lower case. These screws are of the following lengths:

  •  Two 9 mm screws
  • Eight 2.6 mm screws

Step 2

battery replacement

Place your fingers between the display and the lower case, then pull upward to detach the lower case from the Air.

  • Remove the lower case and set it aside

Step 3

  • Grap the clear plastic pull tab attached to the battery
    connector and pull it towards the front edge of the Air to disconnect the
    battery from the logic board.
  • Avoid lifting the connector upward while disconnecting it.

Step 4

Remove the following five screws securing the battery to the upper case:

  • Three 6.3 mm T5 Torx screws
  • Two 2.4 mm T5 Torx screws

Step 5

A1466 battery
  • When handling the battery, avoid squeezing or touching the four exposed lithium polymer cells.
  • Lift the battery from the edge nearest the logic board and remove it from the upper case.
  • If you’re installing a new battery, you should calibrate it after installation:
  • Charge it to 100%, then keep charging for at least 2 more hours.
  • Unplug and use it normally to drain the battery.
  • When you see the low battery warning, save your work and keep your laptop on until it goes to sleep due to low battery. 
  • Wait at least 5 hours, then charge your laptop uninterrupted to 100%.