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how can I remove and replace battery for Mac book Pro retina 15” mid 2012 version?

Here is iFixit’s guide for replacing the battery on your computer: MacBook Pro 15" Retina Display Mid 2012 Battery Replacement I haven’t performed this repair myself, but I believe it’s a bit of an ordeal to deal with all the glue, so I’d make sure that you have a decent amount of experience and comfort with repair before attempting it. Best of luck!