Does a Battery Need to Be Vented

For safety’s sake, these potentially explosive gasses must be allowed to vent to the atmosphere and must never be trapped in a sealed battery box or tightly enclosed space!

What happens if you don't vent a battery?

You have a major fire hazard or even an explosion in your boot, as while lead acid batteries are being “used” they release toxic and flammable gasses. Also the gasses could/will leak into the cabin .. if that doesn’t kill you, then you’d prolly lose a damn few brain cells.

How much venting does a battery need?

Battery compartments shall be ventilated with openings having a minimum area of 1.7 square inches (1097 mm2) within 2 inches (50.8 mm) of both the top and bottom.