Are these car batteries like a UPS? When one battery in the bank dies, the whole bank goes dead?
I wouldn't want to hit a bump in the road and wiggle a cable that makes the car sputter.
I know this is a silly question. What happens if you cross a river fording and the car floods. Could you get electrocuted? It happened to me in a flooded VW beetle some years ago, and the experience makes me wonder everytime I see those cars on the street.