Venting trunk mount battery?

famous bob said

you could just run a non vented sealed battery too. still like a sealed rear firewall tho.

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You have to be careful here. Not all "sealed" batteries are truly "sealed." Most lead-acid car batteries are not, and still must be vented. So far as I know, only special batteries such as the Optima type (AGM). Some "more conventional" lead acid batteries are actually sealed, but not all of 'em