Well it was 2005 when I built the battery boxes, plywood, and I sprayed them with vehicle undercoating. Let it dry and it has worked great.
The plywood tops to the boxes is screwed on tight.
I drilled 4 1" holes in the bottom of the battery box and front compartment floor.
I took the original vent hose still connected to the front vent, and got additional hose.
I put a coupling on the hose, into the top of box 1 with a "TEE", then to the second box again into a "TEE", the I drilled the top of the box to put the TEE into.
After the last tee, the hose curls around and to the original hole from the 12 volt battery box.
I put in the system where you can filled the batteries with distilled water from the outside, a hand squeeze bulb connect to the hose.
Has worked great.
The other thing I have done is to put in a A B battery switch.
When we are parked and on electric power, I have the battery on A which is a OPTIMIZER, deep cycle battery, no need to be vented, it is a gel battery.
Then about every two weeks, I switch to B the battery bank for a day or two.
Once a month, I unplug from power, and run off the battery bank, inverter for a day, to cycle the battery bank.
Also with the A B switch, if we are dry camping, and run out of power, I can switch to the single battery to get me out of trouble.
Good luck
E. Sven
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