Short camera cable soldered directly to contacts on the DPS-9000 circuit board. Contact to left is positive. Contact more toward edge of board is negative. Some cords have + polarity marked with a stripe. Center contact must be positive. If not sure, check continuity with a voltmeter. Cable is routed through a hole drilled in the bottom half of the casing, just above the cutout in the corresponding half. Tie a knot in the cable before you solder if you want some "strain relief".

CAUTION!!! Make sure the clear plastic insulator (not shown in the photo) is replaced between the battery and the circuit board and that it placed to cover both battery terminals. The battery terminals can very easily short to the board if not properly insulated by the plastic sheet.