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Old 01-21-2008, 08:21 PM   #1
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Battery vent - or AGM

My 1960 safari has a group 27 size lead acid battery that the PO mounted under the goucho. I has no vent to the outside of the trailer, and there is no room on the tongue for a battery. How should I vent this? I don't really want to cut a hole in the skin to do it, and I am not sure that a vent cut throuth the floor would work since hydrogen is lighter than air. Should I just get a couple AGM batteries? I have harm that my intelli power with a charge wizard could hurt AGMs.
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Old 01-21-2008, 08:30 PM   #2
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I think you'll be OK with the Charge Wizard. Its the gel type batteries that need a "different" Charge Wizard.
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Old 01-21-2008, 08:35 PM   #3
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Lot of Mercedes cars have batteries installed under passenger seat. The batteries with vent tube build-in are widely available and at Costco one cost $70.
Those are automotive style batteries, not deep cycle, but with 100 months Costco warranty why would anyone care?
I just discover that my Airstream had original battery placement in rear compartment with no vents. Is that what you call goucho? There is a top cover with hole for tubing connected to about 1/4" vent below license plate. Don't think the cover is seal-able in its present condition, but just a tough.
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Old 01-21-2008, 08:42 PM   #4
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Mine is in the same location. I use a sealed Odyssey RV battery. I've been very happy with the capacity.
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Old 01-21-2008, 09:16 PM   #5
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I thought about the sealed lead acid batteries too. Don't they gas if overcharged?
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Old 01-21-2008, 09:18 PM   #6
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kajtek, do you mean that the vent tube is only 1/4" diameter? That sounds way to small to me.
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Old 01-21-2008, 09:35 PM   #7
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Yeah. The 1/4" vent tube is standard for battery equipped with them.
See if you have small plate sticking out right above rear access door. Is there a hole below it?
Having several vehicles, I've been using automotive batteries in RV for years. The only precaution with them is that you can't discharge them too low (I believe 10.5V) what was never issue with me.
The marine batteries used to come with 2 years warranty and didn't last much longer. Even older automotive batteries gave us 7 years of service. Right now the battery in our SUV is 10 years old.
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Old 01-21-2008, 09:43 PM   #8
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No, there is no vent at all. The original battery was located in a small aluminm box on the outside front wall, behind the propane tanks. It fits some kind of wierd size battery. I want to use two batteries anyway, so I need vents or AGMs. I'm surprised that your automotive batteries lasted so long. I have never tried them for this purpose.
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Old 01-21-2008, 09:58 PM   #9
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I'll take a picture of outside vent tomorrow (if I get a break in the weather). My suspicious is, that you have a hole above your access panel.
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Old 01-21-2008, 10:05 PM   #10
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IIRC - the weird size battery was actually a tractor battery. Long and narrow - like this one..

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Old 01-21-2008, 10:07 PM   #11
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The regulations for cars and RVs are different. If a battery is installed inside an RV the vents (on high and one low) need to be 3/4" diameter, and connect directly to the outside.

I don't make the rules, I just report 'em.

I took the long skinny battery box off my '59 and mounted it under the rear window to hold hoses and wheel chocks.
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Old 01-22-2008, 12:38 AM   #12
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Gas

I think the batteries can produce both hydrogen and Hydrogen Sulfide gas. I always recommend AGM for any indoor applications. Better safe than sorry, they are a bit pricey. I am not sure on that charger/converter, but many chargers have smart chargers with AGM settings.
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Old 01-22-2008, 03:25 PM   #13
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Here are pictures of battery vent and OEM cover.
Attached Thumbnails
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Old 01-22-2008, 05:21 PM   #14
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I went with an AGM battery (Optima brand) since I relocated my battery to under a gaucho. No worry about fumes or leaks with the Optima so it was worth the price to me
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