Use this guide to remove and replace the glued-in battery from your 12-inch MacBook with Retina Display. This is best done with the help of an iFixit battery replacement kit; the liquid adhesive remover in your kit will dissolve the adhesive securing the battery, allowing you to remove it with ease.
'''iFixit adhesive remover is flammable.''' Perform this procedure in a well-ventilated area. Do not smoke or work near an open flame during this procedure.
'''For your safety, drain your MacBook Pro's battery before you begin this procedure.''' A charged lithium-ion battery can create a dangerous and uncontrollable fire if accidentally punctured.
The MacBook's battery contacts are located under the logic board, and this guide recommends removing the logic board completely for battery replacement. While it's possible to remove the logic board screws and simply tip the board up slightly to remove the battery, it's very difficult to install a new battery correctly with the logic board still in place.
'''Note''': The solvent used to dissolve the battery adhesive can damage and/or discolor certain plastics. Take care where you apply the solvent.
'''To avoid logic board damage''', when your MacBook repair is complete ''but before powering it on'', [https://www.ifixit.com/Guide/Applying+Low+Voltage+After+Every+Repair+%28Retina+MacBook+2015+Only%29/107711|connect it to low-voltage power] using a 5-Watt iPhone charger and a USB-C to USB-A cable. These accessories are not included with your MacBook, so make sure you have them ready before you begin.
To reassemble your device, follow these instructions in reverse order.