you could take the male cigarette lighter style plug off and determine the polarity of the 2wires and then just hardwire it to any 12 volt supply or if you want to make it so it unplugs you can use a 2 wire plug - go to electrical connections website to find options
The lighter plug is usually an adapter, changing 12v to a lower voltage to power the devise being used. I'm going to wire in a blue tooth ear piece for a phone into my IS, using the schmatics found on goldwingdocs.com, and to get the power, I was going to "hard wire" the lighter adapter into my bikes 12v system. You just go out and get the right charger for the devise you are wanting powered.