The usb cable is completely removable, which leaves the two power supplies. These can both be replaced by rechargeable li-po batteries when the dragon moves beyond the current testing phase.
That's the easy bit though. I want a control panel which will allow me to interact with the dragon and control him to move around, which means I will eventually need to work out some remote wireless i/o. I'm not going to be up to that for a while though, so I can do a lot more research first.