Ok, for anyone that knows anything about electrics... The batteries would short circuit and burn. They'd have to be in an explosion safe cell as lithium burns when over heated.

For the people handling the car it would pose little to no risk as electricity generally takes the shortest route between positive and negative which means though the body work, through a cable or anything that doesn't have the thousands of ohms a human being has.

Humans have to be the only conductor between positive and negative to conduct... It is still surprising that so few actually know this.

The major hazard would be short circuit and battery explosion and for that there would have to be some form of protective case to the batteries (preferably water proof).

Hybrid systems are not more dangerous in road going version than they are in motorsport version.