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To separate the adhesive securing the final two, middle battery cells, apply another 1 milliliter or so of liquid adhesive remover (or your iOpener) to each cell.
It may help to elevate one side of your MacBook Pro a few inches so that the adhesive remover flows in the correct direction, underneath the battery cells. You can use a sturdy book or foam block to prop up one side of your MacBook Pro while you work.
Insert the card about an inch between the left-center battery cell and the upper case, separating the adhesive between the cell and the case.