To separate the adhesive securing the final two, middle battery cells, apply a few more drops 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.