Electronics newbie here. I'd like to connect a model train smoker (6 volt) to my xbee. Why can't I just wire in series a second 3 volt battery to bump the output from the xbee to 6 volts? Will I fry my xbee? A guy at Radio Shack wrote a circuit for me that has a transistor and a resistor that I wrote up here: https://electronics.stackexchange.com/questions/317977/xbee-running-stuff-that-requires-more-than-3-volts and I wondered if I needed those components?