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.

Apply the adhesive remover sparingly, since the trackpad lies beneath this area of the battery.

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.