If you're using the old-style iFixit adhesive remover with separate bottle and syringe (no longer sold), click here for a slightly modified set of instructions. I recently replaced the battery in my MacBook Pro retina 15in mid 2012. This guide instructs you to remove the speakers before proceeding to the battery. Note: The solvent used to dissolve the battery adhesive may damage your speakers if it comes in contact with the plastic speaker enclosures. Tested and guaranteed to have no cycles on the cell and to have a capacity greater than 8250 mAh. If your battery is swollen, take extra precautions. This MacBook Pro (Retina, 15-inch, Mid 2012) replacement battery is what you need to bring your dead MacBook Pro (Retina, 15-inch, Mid 2012) back to life 100 factory tested. A charged lithium-ion battery can create a dangerous and uncontrollable fire if accidentally punctured. To minimize risk of damage, turn on your MacBook and allow the battery to fully discharge before starting this procedure. The 13-inch MacBook Pro has a built-in 63.5-watt-hour lithium-polymer battery. Do not smoke or work near an open flame during this procedure. Non-Retina MacBook Pro review: Battery life. Perform this procedure in a well-ventilated area. IFixit adhesive remover is highly flammable. The adhesive remover in your kit will dissolve the adhesive securing the battery, allowing you to remove it with ease. Use this guide to safely remove the glued-in battery from your MacBook Pro with the help of an iFixit battery replacement kit.