5. Power options
The Romi chassis has multiple options for configuring the batteries. The battery compartment is separated into two sections: a four-battery section and a two-battery section. Either section of the battery compartment can be used independently, shown in the diagram below with nominal NiMH voltages and a common ground:
Another option is to use all six batteries in series. To do this, simply solder a jumper wire from the negative terminal of the four-battery section to the positive terminal of the two-battery section as shown below:
If you use the Power Distribution Board for Romi Chassis, it defaults to getting power from all six batteries, but it can be reconfigured to be powered from four cells; see the board’s product page for more information.