I ran the 680 in my 23 for 3 years and it never let me down. That car ran a 9.5 cr 350 Chevy. I was leary about if it would have enough juice to crank my motor because it is only 7 x 7 x 3 inches, but when I spoke to one of the principles at Odyssey he told me he uses the same battery to crank a blown BBC engine in his car.

Sometimes the car would sit for a month or more and never cranked slow or failed to start.

Don