Original DeWalt Battery connector created by urw. I modified it to accept 2x M3x12mm screws from the bottom of the baseplate into the battery connector terminal.

This model uses a 120mm computer fan and the self-tap screws that come with it, DeWalt 12v Max or 20v Max battery, and this toggle switch.

The battery connector requires 4 total M3x12MM screws (2 to mount to base, 2 to attach the retention clip), I used the blue wiring connectors with 18ga wire, the battery terminal and retention block work better with silicone jacketed wire as it is a bit thicker.