Wet cell batteries - Dangerous gases ?

The dangerous gases referred to would be hydrogen, which will require vents bottom and top to prevent buildup to explosive levels. If there are not already vents, you better get out the hole saw and make some.

I would be very very surprised if the battery compartment is not vented to the outside, with it being in that (quite common) location. On my Coachmen, it's very well ventilated, in as much as the "compartment" is a simple rack attached to the frame under the steps. You can see the ground around and in between the batteries.

Wet cell batteries also give off some acid fumes, though that's not the primary concern here.

You need to check it carefully for venting - it won't be hard to find if it's there.
If not, you have to vent them.

I see three holes in the back side of the case. One on each end with cables through them and another between the batteries. If these go under the RV to open air they should be good.

AGM batteries can give off hydrogen gas if overcharged. They have pressure relief valves for this purpose. I would assume that Winnebago designed this eventuality into the box design. It doesn't take much air to mix with hydrogen to diffuse the situation. I would guess that the holes where the cables come through are enough.

The batteries in my BMW and Charger are both in the trunk and pretty well sealed. They both have vent tubes are about the size of a soda straw. The Charger is a wet cell and the BMW is an AGM battery.

The rubber seal should be adequate.

X2 above ^^^^^^

If this is anything like my under step battery compartment, it is open to the under side. NO problem. Mine is a 2004.

LEN

DrewE wrote:
I would be very very surprised if the battery compartment is not vented to the outside, with it being in that (quite common) location. On my Coachmen, it's very well ventilated, in as much as the "compartment" is a simple rack attached to the frame under the steps. You can see the ground around and in between the batteries.

Wet cell batteries also give off some acid fumes, though that's not the primary concern here.

This is the same way my Winnebago View is done, the batteries sit on flanges and there are large gaps that leave open areas open to below. Good batteries do not generate any measurable amount of gas when topping off. Its not a real concern and I am sure the manufacturer would have planned for standard batteries in the design or it would have some cautions in the manuals, placards, etc to only install AGM batteries.

Charles