Mini power supply
I'm going on a drinking binge camping trip and we want to watch some movies while we are there. all the movies are on a portable hard drive. I have seen somebody take something and hook it up to a battery and then plug an xbox and tv into that something. we have a car, no generator but we want to be able to power a computer and moniter, in the middle of nowhere and not run the car battery down. How can I do it.