MacBook Pro 15" Retina Display Mid 2012 Battery Replacement (Legacy)

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While lifting the plastic frame out of the way, push one corner of your plastic card underneath the outside edge of the first center battery cell.
Do not pry along the edge nearest the battery connector, or you risk damaging the keyboard ribbon cable.
Slide your card all the way under the battery cell, and leave it to prevent the battery cell from re-adhering.

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