So yesterday morning I left my head lights on at work. Completely drained the battery. I remember seeing a device that connects to the battery + terminal. If the battery is being drained it will cut off the connection to where there's just enough juice left in the battery to start the car. Anybody have any experience with one of these? Here is one that I found:
http://www.autoaccessconnect.com/batterybrain.html
http://www.autoaccessconnect.com/batterybrain.html