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Old 04-11-2021, 06:47 PM   #1
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Deep cycle battery issues

I have a 2015 Maple Country TT. Last year I noticed in the spring that my new battery(bought the previous May) would not charge. It had spent the winter in my house, so it never had a chance to freeze. It was replaced under warranty and the only visual sign that something was wrong was that the sides were sucked in. So, I got the new battery and it worked fine last summer,; however, we did not use the camper as much as usual due to Travel restrictions.

Yesterday, I took the battery out of storage to charge it up and noticed the sides of this one have started to bow in as well and it will not charge.

Has anyone experienced this before? I am wondering if there is something wrong with the charging system in the camper. I am not even sure where it is located.

Any ideas would be appreciated.

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Old 04-11-2021, 08:05 PM   #2
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I gave up on the traditional 12v deep cycle battery years ago after replacing one after another yearly.

I went to dual 6v Golf Cart batteries and never looked back. Much better performance and they can take more abuse.

First thing I did when I bought my 2015 Sunset Trail this spring was to ditch the single 12v battery.
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Old 04-12-2021, 05:58 AM   #3
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Hi I had a battery explode in the camper. It was 4 years old and when we got back from a trip the top of the battery was broken. It was a deep cell Interstate. Has any one else had this problem?

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Old 04-12-2021, 08:37 PM   #4
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Do any of you leave your deep cycle on a battery maintainer over the winter?
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Old 04-12-2021, 09:02 PM   #5
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That's strange - i have seen batteries bowed out but not bowed in.
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Old 04-12-2021, 09:25 PM   #6
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I've seen bowed in at top. It means very hot and most likely dry. Happens from poor chargers that don't stop charging.
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Old 04-13-2021, 06:34 AM   #7
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Originally Posted by akaustin View Post
Do any of you leave your deep cycle on a battery maintainer over the winter?

I have been using a battery minder for quite a few years now. In fact I have 3 of them that are used in different applications.

When I put the camper away for the winter, I hook the battery minder up to the two 6V deep cycle batteries. They have always been good in the spring.
No more dragging them out and storing in the garage, and no more worry about freezing and breaking either.
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Old 04-13-2021, 10:43 AM   #8
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Also hooked up all winter with no problems in the spring.
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Old 04-13-2021, 02:16 PM   #9
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akaustin, you should check your charging system.
I think that every RV owner should have a multimeter, and learn how to use it to check and troubleshoot the electrical systems in their RV.
Get a voltmeter, and check your battery, unloaded and disconnected. You should have well over 12 volts, charged.
Connect it to your RV, and when connected, the converter should be charging or maintaining it. Across the battery terminals, you should get over 13 volts. If you have a bad battery, these voltages will differ.
Your RV should have a 3 step convertor. I would find the model and get the manual. I have a 2015 with a WFCO 8955, and the manual is available on the web site, and it is a nice manual.
I would check the convertor with a known good battery. A battery that is caved in can mean it has been cooked by an overcharge, or low/dry cells. When fully charged, your 3 step convertor should be in 'float or maintenance mode', charging at about 13.2 volts.
I am among those that have gone to 2) 6 volts GC2 golf cart type batteries. They are 105aH each, in series, 210aH. Over triple the amps of the typical deep cycle, and they work flawlessly. Costco, less than $100 each. I even found a nice battery box that fits in the original battery area behind the LP tanks.
I live in Minnesota, we saw 25 below a few days this winter, and my batteries do just fine left on the camper, with my RV plugged in. I look at the water once every 6-8 weeks. as long as I'm not discharging the batteries, they never need water (I still check).
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