>> I’m not so sure about the Honda mega-cap starter battery, though. <<
I think this is the link:
Your link didn’t work, but I looked up similar ones and the videos were quite compelling. Cars can easily be started with super capacitors.
The problem I see, though, is lifetime complete replacement of a battery with them. To store the same amount of energy as a battery, a currently available super capacitor pack would weigh about a hundred pounds and occupy about 20 cubic feet of space. The super capacitors in the videos stored only a tiny fraction of the energy that batteries store. They simply can’t handle prolonged time between recharging, small draining during disuse, or alternator failure during driving. They would only keep the car running for a couple of minutes if the alternator failed at night.