Why is the teardown of the MacBook Pro 15" Retina Display Mid 2012 not as detailed as the teardown of the MacBook Pro 17" Unibody Logic Board Replacement? This is not nearly as helpful as your other teardowns because of lack of detail. The battery can be replaced fairly easy with the use of Isoproyl alcohol 99.9% pure. Use a syringe to squirt it under the batteries and then work it around under them. Let it set a few minutes to soften the glue and then began prying the batteries up. As you get the batteries to pry up a little, squirt some more alcohol under them again and let it sit a few more minutes. Then begin prying them up again. There is a metal cover between the two middle batteries and trackpad, protecting the trackpad ribbon cable. Make sure you stay between the battery and the metal cover as you pry the battery loose. Take your time and you will have no problem getting the batteries loose. It took me about 30 minutes.
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