Starting a Car with a Toy Plane Battery

Okays, so I had a car with a flat battery. My jump starter died some time back, and all my friends who could have jump started the car were out. Now on paper I knew that the little batteries I use to fly the model planes should be able to have a good go at jump starting a car..but the ultimate test is always does it work in practice. 10 minutes later I had soldered up some junk I had and was ready to give it a go. Win Blog! ;-)