Sounds like the one I bought.....actually two of them.........one for my car and one for the wife's. I've had to use it to start my car at the field because I left the doors open all day and ran down the battery. Radio Shack also has a thing that plugs into your cigarette lighter that has two banana female receptacles on the end to plug chargers in as well. I carry both of these and a charger in my car so I'm never without. Also.........if your field box battery is charged up you can use that.