I thought Optima batteries didnt vent cause they were special type or something.sunnysentra said:You need a battery box with a sealed vented type unit. You need to vent the battery box to the outside with a hose. Moroso makes a box, not cheap, but its for regulation. If you are inspected by the state and its not there, you may not pass inspection. Plus, the gas is not good to breath!!!! All batteries have gasses, but are inside the engine compartment and its doesn't matter there, but in the trunk or cabin, you need to vent the gas.
Chris 92 classic