The battery shall be securely fastened to the car. No Bungee cords or rubber cords may
be used to function as the sole hold down mechanism. An electrically non-conductive
material must cover the positive battery terminal. Any battery located inside the driver’s
compartment should be fully covered and firmly secured to the chassis (or tub) in a
marine type battery case. True dry cell batteries may be mounted without a surrounding
case, however a case is still recommended.
This is the rule I was referring to which doesn’t say much about fuel cells.
How would a 125# steel battery box ever be considered a “marine type battery case”