A Useful Astronomical Accessory

I have a little 7 amp-hour 12-volt battery that I use to power a red neon light out in the observatory--the battery is a "jump starter" from Radio Shack. Turns out it's also useful for when your child plays in your car and leaves the headlights on and you find it dead the next morning on your way to work. Imagine, using a jump-start battery to start your car!