Obtain a foam-wrapped battery from the previous step, and 8 standoffs

Screw the standoffs together as shown, to make four 3-inch long standoffs

Screw the standoffs into the enclosure, then place the battery vertically in-between the standoffs

Make sure the sensor wires and desiccant cartridge are secured inside the box.

Make sure the battery is positioned so that its wires are on the sensor's side of the enclosure