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post #1 of 40 Old 01-13-2008 Thread Starter
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Group 31 Battery Capacity

I need to upgrade my house bank. I'd like to have between 225 and 300 Ah. (that's 3X and 4X my daily consumption, respectively). My budget is tight so I had been thinking of going with 6V golf cart batteries, but my existing battery boxes (each: 8"W x 14"L x 10"H) won't except 4 of them. But they will take a couple of group 31's.

I found this wet-cell and was wondering what people thought. This seems like a high amount of amp hours for a G31 battery to me. Is the weight (62.4 lbs) too light? Am I crazy to order batteries off the net? Are these likely to have less cycles to them?

Thanks!
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post #2 of 40 Old 01-13-2008
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Shipping costs for 70 lbs?

And don't you have a local store near your house?


I'd try a Mr. Google, he's been known to be very helpful at times like these............
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post #3 of 40 Old 01-13-2008
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That sounds awfully high for a Group 31 battery. Most of the Group 31 batteries I'm familiar with have a rating closer to 100-120 Amp-hours at the 20 hour rate. These say they're rated at 140 Amp-hours... which is 16-40% more capacity than other Group 31 batteries. I'm also not too familiar with that particular brand, but defender.com generally sells decent products.

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post #4 of 40 Old 01-13-2008
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Take a look at Interstate Batteries. A lot of bang for the buck.

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I had a dream, I was sailing, I was happy, I was even smiling. Then I looked down and saw that I was on a multi-hull and woke up suddenly in a cold sweat.
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Originally Posted by Freesail99 View Post
Take a look at Interstate Batteries. A lot of bang for the buck.

Anyone know if it's still true (as of the late 90's at least) that there are actually only 3 lead acid battery mnfgs. in the States? I was told this more than thrice............
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post #6 of 40 Old 01-13-2008
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Personally, the one aspect of West Marine I do like - is their batteries and replacement policy. I have had three batteries fully replaced with no questions asked (when I first bought my Cat the 2 batteries died (well less than optimum charge retention) they just replaced them as they were within the warranty period) and if you compare the cost of shipping + cost of a battery via the net - you really can't beat the knowing you can lug them to a store and 30 minutes later have new batteries and be ready to go....

-- Jody

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post #7 of 40 Old 01-13-2008 Thread Starter
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These say they're rated at 140 Amp-hours...
Yea, this is the part that intrigues/scares me the most. $115 for 140 amp hours is pretty darn cheap!! (shipping aside.) Seems to good to be true and we know what we like to say about that...

I do agree with Jody as well; brick and mortar can have it's advantages.
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I bet those batteries have been sitting for a while so the price is more reflective of the 'not ready for clearance or recycling program'. Considering the average Group 31s run around $179 brick and mortar...

Defender however is a top notch place from people I know that order stuff from them - but - I would ask about return policy on the batteries as well as checking the date of manufacture for the batteries. That does seem a bit too good to be true unless it is just a auto battery with a marine label on it....

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I bet those batteries have been sitting for a while so the price is more reflective of the 'not ready for clearance or recycling program'. Considering the average Group 31s run around $179 brick and mortar...

Defender however is a top notch place from people I know that order stuff from them - but - I would ask about return policy on the batteries as well as checking the date of manufacture for the batteries. That does seem a bit too good to be true unless it is just a auto battery with a marine label on it....
This may be a naive question, but how long can a battery sit on a shelf? I know it'll lose a few percentage points of charge each day if left idle, but when unused, do the plates just deteriorate over time?
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The warranty on those batteries looks a bit weak compared to the normal warranties other batteries have.

As for wet-cell batteries... if they're just sitting on the shelf, the plates will start to sulfate as the charge level slowly drops. Wet-cell batteries don't tolerate sitting for long periods of time very well.

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—Cpt. Mal Reynolds, Serenity (edited)

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