This has got to be some of the cheapest insurance you can buy against a dead car battery. The Porta-Jump glove box battery jumper is tiny at only 3" x 3" x 2.5", yet has enough power to jump start a car in as little as 10 minutes.
Not only is it inexpensive and small enough to fit in the glove box of your car, it allows you safely jump start your car from the safety and comfort of the drivers seat.
Simply plug the Porta-Jump glove box battery jumper in to your cigarette lighter and wait for the unit to beep. Once the unit beeps you can safely start your vehicle. The unit stays charged for up to five years and can recharge off of your cigarette port in about 30 minutes.