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Once you've soldered all the wires from the harness into their respective pins, you can attach the forward battery terminals to each battery pack. This will be done in a very similar way to how the rear spring terminals were wired.

Start by sanding in the corner of each battery terminal and placing a large glob of solder there.

Using pliers (since the wire will likely get quite hot) hold the wire lead against the solder blob on the battery terminal and heat the terminal until it accepts the wire.

Hold the wire in place with the pliers until the solder cools and hardens.

You can also now attach the motor bells with propellers to their motors. You want the two aft props to be counter rotating- preferably so that the port propeller spins counter-clockwise (and the starboard propeller clockwise) when the ROV is moving forward.