[ponchonutty]

How do you know the battery was 3/4 charged? What value did you use to come up with that???? Anything less than 11.5v can be hard to make some vehicles start. Couple that with a bad cell or 2 and it shouldn't ever start. You don't just need voltage to start a vehicle but AMPERAGE. I've had batteries with over 12v at rest but drop down to 9v. when cranking. It's the same difference when looking at engines. People get all worked up on horsepower but it's torque that gets you going. A lower HP engine with higher torque is usually a better way to go. Don't think so? Just look at diesels.