This charger saved me $200+ in the first two weeks of ownership. First the alarm on my ZX drained the battery and refused to take a charge from my old battery charger. I faced having to get another battery ( I had just replaced this one 2 years ago) or take a chance on the Tecmate. The Tecmate not only brought my battery back to life, but it also saved the two year old one I still had sitting around. The next week the battery on my BMW 325 died after a plugged in item drained it over the weekend. It refused to take a charge after two days of sitting on my automotive charger and I was losing hope. Have you ever tried to get a new battery for a BMW? I love this product!!!!