Yes. Go to RS and buy the cable and adaptaplugs from the posts above, but splice another wire off of ("Y") it and solder (or some sort of quick connect, etc) the 5 volt car kit from Wallmart onto this cable and your happnin'. So it would be like this: out of battery>"Y" junction>one side goes to UA5, the other goes to 5 volt car adapter>JB3. The car kit steps the voltage down from 9 to 5, or 4.5 depending. Double check polarity!!
Scott