I bought one for my airport car... it didn't seem to work very well, in fact, I wondered if it was a battery "dis"-charger manufactured by the car battery folks (to make you have to buy a new battery).

In case you don't know ... the guard shack (as you drive into the Democrat lot) has a portable jumper battery. I haven't had much luck with it, it doesn't seem to have enough juice to start my dead battery, other guys have had good luck with it (I have no problem with jumper cables from another car?)

TTFN ... MM