Use this guide to remove the glued-in battery from your MacBook Pro. This is easily 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. Alternatively, you can use an iOpener to apply a modest amount of heat in order to soften the adhesive before prying out the battery.
'''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.