Go to Walmart and buy a $30 Black&Decker Jumper battery, you will use it to start, charge, all kinds of things, it comes with 2 or 3 chargers from the house or car, will jump off your miata or the honda thats been sitting in the basement for 3 years (yes it will) and anything you need 12 volts for at the field without ruining your car battery (had that happen too)...its a great investment,I saw a guy at the field with one charging his lipo's and I was having trouble (redoing a 91 miata) with a car and BOING it hit me , what a great idea...so I got one, very useful so far and after 2 days of carb cleaning I DID get my 95 Honda Magna running!!!...course the tank is shot but thats another story......Rog