I'm just waiting on time to free up to mount my 2nd battery. I was telling my uncle what I was doing (and while I'm sure I'm fine) he said I can't mount a battery on the driver's side passenger floorboard without venting. I know with a standard lead acid battery you need some sort of venting, and I'm going agm. He did raise enough of doubt that I'd rather ask the dumb question...do I need to vent an agm in the passenger compartment?