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Editing Step 36 —

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Just as the marks were made on the motor lead wires, make marks on the battery lead wires at 50cm (for what will end up being the port battery tube) and 43cm for what will be the starboard battery tube.

Label the battery tube lead wires in the same way the motor lead wires were labeled- flags with "P" (red) or "S" (green) about 5cm above the length mark. Also, it is a good idea to find the longer of the two wires coming from each battery tube and put a separate label on those wires indicating they are the "negative" polarity for that tube.

You'll know which labels are motors vs battery tubes because the motor will have three wires and the battery will only have two.