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Old 07-27-2012, 09:39 PM   #1
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12 Volt Battery Choice

My trailer seems to be a battery eater. I've had three Interstate SRM-27 lead acid batteries in six years. Here is a link for an example:

http://www.interstatebatteries.com/c...ement++battery

I keep it charged and level checked and top it off with a Honda 2000 when bookdocking so it has been resonably well teken care of.

Anybody have better luck with a battery?

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Old 07-27-2012, 10:09 PM   #2
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Re: 12 Volt Battery Choice

I assume they have been replaced under warranty, otherwise I'd go with AGM.
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Old 07-27-2012, 10:39 PM   #3
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Re: 12 Volt Battery Choice

I am on my 4th year with my dual 6V batteries, and they appear to be holding a charge real well. I do nothing special but keep them charged as often as possible, and check acid levels once or twice a year. I do leave them in the trailer over winter, but put them on to charge once or twice over the 6-7 months.

That does seem like a way too short of life if you are caring for it.
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Old 07-27-2012, 11:29 PM   #4
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Re: 12 Volt Battery Choice

Two were replaced under warranty, one died at 35 months. The trailer puts about 16.5 volts across it for charging when weak.
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Old 07-28-2012, 12:58 AM   #5
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Re: 12 Volt Battery Choice

If you are near a Costco Warehouse check out their RV Batteries with 100 month warranty. Bought one in 2009 the battery would not hold a charge took it in got 100% credit for it and bought another one same size zero cost out the door.
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Old 07-28-2012, 01:56 AM   #6
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Re: 12 Volt Battery Choice

Hi: All...We're still on our original battery from '07. Are we doing something wrong Alf
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Old 07-28-2012, 06:54 AM   #7
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Re: 12 Volt Battery Choice

What about your discharge level? If you frequently take your battery below 50% before recharging you will shorten battery life. With your generator I doubt this is the case but thought I would ask.
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Old 07-28-2012, 10:07 AM   #8
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Re: 12 Volt Battery Choice

Quote:
Originally Posted by Thane
Two were replaced under warranty, one died at 35 months. The trailer puts about 16.5 volts across it for charging when weak.
That voltage seems kind of high, I thought 14.5 was the desulfication mode and 13.6 was normal. You may be boiling away you acid.. Check your converter output spec's.
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Old 07-28-2012, 01:39 PM   #9
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Re: 12 Volt Battery Choice

Thane, I don't know what you mean about 16.5 and weak. We have been told that 16.5 is dangerously high. Normal when using the trailer is 13.6 as far as we find.

I don't know what low is and when someone needs to start charging with a charger though. Maybe someone can comment on that.
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Old 07-28-2012, 02:13 PM   #10
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Re: 12 Volt Battery Choice

here is a chart, notice the range from 11.90 to 12.6, with 13.6-14.0 the highest for bulk or desulfication.
Here is a link for some reading also http://www.marxrv.com/12volt/12volt.htm
Attached Images
File Type: gif voltchart1.gif (6.4 KB, 15 views)
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