Originally Posted by ATVer
My 3120 battery box is ventilated on the rear side where the positive cable goes thru. I also ran my battery tender lead thru the hole. Unless you have Optima style batteries I think they all should be in vented compartments.
My coach is a 2014 and had entry ports for the battery cables but Forest River filled/sealed the openings with the urethane foam. I don't consider these "vents" although if battery gases did build-up it could vent through these ports if they aren't sealed too tight.
Optima is a brand name but is synonymous to dry cell or absorbed glass mat battery and would be am excellent application as a deep cycle battery.
Both vrla and glass mat batteries are suitable for enclosed battery wells.
Also I need to point out my wording error in my previous post; I stated "vent regulated lead acid", it was supposed to be "valve regulated lead acid".
I did a post months ago on on my battery well fix: Battery Box Fixes