bobg.
I bought the batteryminder and tried it. Don't waste you money! The product is just another trickle charger that doesn't put enough of a charge on the battery to start the car. I had to put the car on a 100 amp starter(start, not charge position) to get it started. Then the battery would only hold a charge for about 4-5 days. This was a new battery the previous summer. by the fall it was totally shot and had to buy a new battery. I guess batteries don't like trickle chargers like a previous poster said.