Astrozap DC Power Adapter for Car Cigarette Lighter Socket
This DC Power Adapter from Astrozap allows you to operate your Astrozap heater (requiring 12 VDC) from your car battery. It consists of two cables: One cable plugs directly into your car's cigarette lighter socket and has a female RCA jack on its other end. The second cable plugs into the first via a male RCA plug. It then splits into a Y-cable (2 cables) which have a red and a white RCA jack, respectively, on the other ends.
This is a simple and full-proof way to power your system all night.