Remove the frame stiffener by unscrewing the six screws.

Near power switch: 3mm black screw

Top, near hard drive slot: two 5mm silver screws

Top, near floppy drive opening: two 4mm black screws

Bottom, near power board: silver 6mm screw (note the unusual length compared to the other silver screws).

Ensure the small piece of amber kapton tape remains attached to the battery wires.