Maybe I could reply:
I can see two reason to add capacitors: high surge of current when the motor starts, or some noise on the power supply lines, which cause troubles with the electronics, or both...
You could run your revy from a 12v regulated supply, if you're sure the regulator will handle the load correctly, and not burn.
You can use any kind of connection you want, of course. If I was you I would pay attention to the shortcuts problems you could get when you carry the marker.
@++
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