The battery is made up of six distinct cells, four of which are adhered to the upper case. Use great care in prying these four cells up from the case—bending or puncturing them can damage their performance, and may release hazardous chemicals. Only use plastic tools when prying.
Use this guide to safely remove the glued-in battery from your MacBook Pro with the help of an iFixit battery replacement kit. The adhesive remover in your kit will dissolve the adhesive securing the battery, allowing you to remove it with ease. The battery is made up of six distinct cells, four of which are adhered to the upper case.
'''iFixit adhesive remover is highly 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.
'''Note''': The solvent used to dissolve the battery adhesive can damage certain plastics, such as the MacBook Pro's plastic speaker enclosures. Take care when applying the solvent.
Replace the Battery in your MacBook Pro 13" Retina Display Late 2012.