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Old 08-11-2013, 04:15 PM   #1
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Battery Life

We have a 2007 International, purchased new. We remove the Interstate deep-cycle batteries in the winter and put them on a battery tender. The batteries are kept clean and the water level is checked regularly. We're on the road about 3 months a year. We don't boondock a lot.

How long should we expect the batteries to last? I think we're pressing our luck at 6 years.
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Old 08-11-2013, 04:34 PM   #2
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What type of Interstate batteries do you have?
I would be extremely happy to get 5 seasons out of my batteries. I usually get 2-3 years.
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Old 08-11-2013, 04:44 PM   #3
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Maintaing a full state of charge, as you have done, is the key to long lead-acid battery life...

In my shop, I answer that with proper maintenance, one should get about 4-6 years 'useful' battery life...

The common type deep cycle batteries on the market today will 'sulfate' to some degree over time, even with proper care - As the sulfate on the plates accumulates, the 'capacity' of the battery to run your 12 volt stuff will diminish...

If you notice shortened run times between charges while off the grid, it's probably a good time to replace with new batteries...

You can take your fully charged batteries to a battery shop and ask them to load test them to give you an idea of remaining capacity...
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Old 08-11-2013, 05:04 PM   #4
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Yup, this is what happen to me! I ended up purchasing two new deep-marine batteries this past week.




Quote:
Originally Posted by Mexray View Post
Maintaing a full state of charge, as you have done, is the key to long lead-acid battery life...

In my shop, I answer that with proper maintenance, one should get about 4-6 years 'useful' battery life...

The common type deep cycle batteries on the market today will 'sulfate' to some degree over time, even with proper care - As the sulfate on the plates accumulates, the 'capacity' of the battery to run your 12 volt stuff will diminish...

If you notice shortened run times between charges while off the grid, it's probably a good time to replace with new batteries...

You can take your fully charged batteries to a battery shop and ask them to load test them to give you an idea of remaining capacity...
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Old 08-11-2013, 05:10 PM   #5
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I'd guess you need new ones. Buy a load tester and you'll always know the story.
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Old 08-11-2013, 05:33 PM   #6
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I'd guess you need new ones. Buy a load tester and you'll always know the story.
Harbor Freight has a cheap one.

Amp 6 Volt/12 Volt Battery Load Tester
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Old 08-11-2013, 06:48 PM   #7
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Many converters have a desulferinator cycle you use once a mouth (on mine it's automatic). Don't know how much good this is, but in the past I've lost lots of marine deep cycle batts. to not keeping them charged in boats. If this works and extends the life - worth while. I now pay the extra for AGM's - no maintenance and no gas - hopefully they will last longer - the Manf. stated up to ten years if kept charged - will see.
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Old 08-12-2013, 06:11 AM   #8
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Thanks

Many thanks to all who have offered guidance. I'll get new batteries today and leave on a long trip tomorrow with confidence.
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Old 08-12-2013, 07:33 AM   #9
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I have the Optima AGM batteries

I have had them about 8 years. They are not performing very well anymore. I also own a back up that I neglected. I was researching ways to charge a dead battery, and I found a video made by Optima that suggested dropping the battery on a soft lawn from waste level. The video said that it would loosen the sulfur. THIS SHOULD NOT BE TRIED WITH A LEAD ACID BATTERY. The main message was to daisy chain a good battery with the bad battery to trick the charger into charging the dead one.
One guy stated that charging a battery would de-sufurize it.

Another website seem to think that totally dead batteries could be brought back to life using a Bendini motor. The Bendini motor is really just a de-sulfurizer...I think.
I was looking for answers and I actually am more confused.
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Old 08-12-2013, 08:32 AM   #10
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The main message was to daisy chain a good battery with the bad battery to trick the charger into charging the dead one.
That's a good way to trick the charger into FRYING the good one! Not recommended!
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Old 08-12-2013, 11:16 AM   #11
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That's a good way to trick the charger into FRYING the good one! Not recommended!
Right... I have used a wire to show voltage then disconnect. Don't leave it connected!!!
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Old 08-12-2013, 12:05 PM   #12
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I generally seemed to get about 4 years out of 12 volt deep cycle batteries.
My 2 6 volt exide golf cart batteries however are just starting on year 11.
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