I agree Bud, but to be honest mainly because I had one left over from Biking days, I emailed them to ask if it would be OK with a car battery and they said fine so I connected it and have used it for 13 years now without a problem on several cars. Only this week I wired up another one (a later model) for a fellow TM'er....reports are its working fine. Like you mine hangs on the garage wall and gets plugged in when I exit the car.
