astounded how fast batteries discharge in storage - Dutchmen Owners

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Old 01-14-2019, 12:47 AM   #1
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astounded how fast batteries discharge in storage

We disconnected our two deep-cycle RV batteries from our trailer at the season's end. We store them in our garage and have worked to keep them fully charged using a smart trickle charger. Because I have two batteries but only one charger, I switch them out ever 1-2 weeks once they are fully charged.

I am finding that my batteries are going from 100% charged to near 0 in about 8 days time. Is this a normal depletion time when disconnected?

Here in Utah, our high temperatures have been in the 30's and our lows are often in the 20's. But these are in our garage, which is slightly warmer (but not a ton). The batteries are Interstate SRM-24 with 690 cranking amps (550 CCA), 81 amp-hours, and a reserve capacity of 140 at 24 amps.
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Old 01-14-2019, 01:06 AM   #2
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I donít think this is normal. I keep a group 24 in the garage with out charging and then charge it before I use it. It has never been at zero, and is usually only slightly discharged and takes less than 60 seconds to hit a full charge on the battery charger.

After you take them out of the RV do you charge them in the garage before trickle charging? My battery usually needs a charge after I remove it due to running the jack and slide out. Otherwise, It sounds like you have batteries that are past their useful life and need to be replaced.
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Old 01-14-2019, 01:15 AM   #3
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Thanks. The batteries were fully charged on the RV before disconnecting them. Also, the batteries are brand new.
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Old 01-14-2019, 04:48 AM   #4
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astounded how fast batteries discharge in storage

Cold weather is hard on batteries but your situation is terrible. I wonder if your batteries are damaged. Are they sealed? Have you checked the water level if not? Maybe they have been overcharged and you boiled out some water? They canít be more than about 2 years old right? I donít get it.

I would also check that trickle charger and see if it is actually cutting off when the batteries are full. Some do not and they will overcharge too.
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Old 01-14-2019, 04:58 AM   #5
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The batteries were purchased brand new 6 months ago, so that is what I mean by "brand new".

Not sure what sealed means, but there are two panels on the top of each battery, each with three round water ports. I have carefully checked the water levels over the few months I have owned them and only had to add about 1/4-inch of distilled water one time.

Not sure how they would ever have been overcharged. The charger is new also and is a smart/intelligent charger with a microprocesser. It is a Noco Genius G3500 (3.5 Amp) smart charger (https://no.co/g3500). "Guaranteed" to not overcharge batteries and to be left connected indefinitely.
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Old 01-14-2019, 05:00 AM   #6
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Originally Posted by Hart_family View Post
Thanks. The batteries were fully charged on the RV before disconnecting them. Also, the batteries are brand new.
Do you have the screws that came with the battery on the terminals when stored or on the plastic holder?
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Old 01-14-2019, 05:08 AM   #7
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Do you have the screws that came with the battery on the terminals when stored or on the plastic holder?
Not sure what you meant...sorry. Here is a photo of the charging battery...
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Old 01-14-2019, 05:11 AM   #8
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Not sure what you meant...sorry. Here is a photo of the charging battery...
Take the wing nuts off the posts! This is what I was talking about. You are discharging your battery by leaving the wing nuts on IMO.
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Old 01-14-2019, 05:16 AM   #9
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Take the wing nuts off the posts! This is what I was talking about. You are discharging your battery by leaving the wing nuts on IMO.
Okay. I didn't think that wingnuts would be discharging electricity since they are not connected to anything or completing a circuit, but I am happy to try that and see what results I get. Thanks.
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Old 01-14-2019, 05:22 AM   #10
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O.k, please let us know if this helps.

When we buy these batteries, they typically come with nuts that are attached to a red plastic post cover. The nuts are not touching or on the positive and negative screw posts of the battery. There is a reason for this.
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