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Old 06-02-2014, 03:24 PM   #1
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Adding a second battery

My van has this battery installed in a rack underneath -



I know that it's a group 31 battery - think I found it here:
NAPA AUTO PARTS

As you can see, there is no info on amp-hours. I'd suspect it's around 100 ah. Probably less. This is probably a cheap battery and not a good, deep cycle one. So I'm open to replacing it when I go to a 2 battery setup.

Here are a couple more shots:



I'm not sure if this is a stock type bracket or custom fabrication for Winnebago. It's bolted to the floor of the van with 4 bolts. Looks like you loosen the two nuts and slide the battery tray out.

Could adding a second battery be as easy as finding a two battery plate and sliding it in this frame and bolting it down? Or get a whole new assembly?

Looks to me the only way to go is a north-south arrangement. There is other stuff blocking east-west unless to added a whole new single battery from somewhere on the other side of the blocking items. Which would mean drilling holes in the van, which I am loathe to do.
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Old 06-02-2014, 05:40 PM   #2
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That's an AGM battery. Not sure how good they are for deep cycle, but I love them in my motorcycles and other things since you don't have to worry about water levels. They can also be installed sideways if you wanted to. With a little ingenuity you should be able to add another one.
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Old 06-03-2014, 08:38 AM   #3
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I was thinking about adding another batt as well, then Im thinking, what about my warranty? If something did go wrong would I be caught? Don't know.
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Old 06-03-2014, 08:54 AM   #4
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al2ride is right, it's an AGM battery.
They are quite expensive, I would take it to a NAPA store and get the details and have them supply you with one that matches. The beauty of AGM's is they don't need to be vented (because they are sealed) and can be mounted upside down or sideways in any space.
If you ask for opinions on AGM's or what batteries are best in this forum you will open a can of worms .
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Old 06-03-2014, 08:58 AM   #5
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Gonational, I wouldn't be concerned about the warranty as long as it is a proper installation. Many folks do it all the time. Our RV came with 1 battery from the factory, the dealer replaced it with 2 6Volt AGM's and I added 4 more - no worries.
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Old 06-03-2014, 08:59 AM   #6
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Quote:
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If you ask for opinions on AGM's or what batteries are best in this forum you will open a can of worms .

Oh no, don't to do that. A can of worms is an understatement. I would personally like to have all AGM batteries in my coach but they are expensive.
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Old 06-03-2014, 09:42 AM   #7
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I don't think I asked anyone's opinion on the battery itself. I know what it is, except for the amp-hour rating which is not published for some reason. I know what AGM's are and how they can be mounted. Like most threads on this forum, they take a winding path away from the question at hand. Which in this case has to do with the particulars on how to add the mount for a second battery.

Someone was kind enough on another forum to give me a drawing from Winnebago on the mounting bracket, but we are scratching our heads as to how you'd actually bolt another one to the underside of the coach.

I do have one option for installing a battery inside the coach. This area under the dinette seat is available, but would involve routing the cables thru the floor of the coach to the existing battery's location. Not keen on this idea.

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Old 06-03-2014, 12:16 PM   #8
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Here is my second battery I added underneath. The factory battery is in a compartment that's just big enough for one battery. I added a battery watering system also because it's impossible to access the caps. I made and designed and installed it all myself. Make sure if you decide to add another one somewhere it needs to be vented to the outside if it's a "wet" battery.
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Old 06-03-2014, 02:03 PM   #9
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Here is my second battery I added underneath. The factory battery is in a compartment that's just big enough for one battery. I added a battery watering system also because it's impossible to access the caps. I made and designed and installed it all myself. Make sure if you decide to add another one somewhere it needs to be vented to the outside if it's a "wet" battery.
What is the point of venting if it's a sealed AGM battery?
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Old 06-03-2014, 02:59 PM   #10
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I don't think I asked anyone's opinion on the battery itself.
You did say you thought it was a cheap battery when in fact is a $260 battery. I think that's why we chimed in. Glad to know you know all about it, but we didn't know you knew.

NAPA AUTO PARTS
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Old 06-03-2014, 03:01 PM   #11
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What is the point of venting if it's a sealed AGM battery?
There is much debate about this. If you read the manufacturer's recommendations I believe it will tell you to vent them. The only problem I know of is overcharging them where the valve could open up.
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Old 06-03-2014, 04:46 PM   #12
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Yeah, I posted that link on the napa store. They also want another $22.50 core charge on top of that price, plus sales tax - that's why I said nearly $300. The only useful info they post is the reserve capacity, but I don't know if you can convert that to amp-hrs. I can only assume that the figure is around 100 ah, as every battery I look up is around that number in group 31 +/- 10 ah.

But if you look at my pic, I have other issues too. Notice the water heater pressure relief vent? Where do the water go?

On the plus side, this coach has the Progressive Dynamics 9200 series 4 stage converter/charger, so hopefully the risk of overcharging is very low. But I suppose anything can happen. Like I said, not really my preferred choice to put it inside.
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Old 06-04-2014, 08:45 AM   #13
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What is the point of venting if it's a sealed AGM battery?
Is your question serious ? Or meant to be funny ? I clearly stated " if it's a "wet"
Battery.
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Old 06-04-2014, 09:23 AM   #14
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I guess confusion - AGM is a wet battery, but sealed. I just assumed you missed my stating it was AGM.
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