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Old 06-29-2015, 10:16 PM   #31
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Calm down. I am not talking about replacing the water in a battery. Jeez 2 oz of mineral oil helps evap. it stays on the top of the water. Goggle it. Still talking about warm areas not freezing places.
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Old 06-29-2015, 10:34 PM   #32
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Calm down. I am not talking about replacing the water in a battery. Jeez 2 oz of mineral oil helps evap. it stays on the top of the water. Goggle it. Still talking about warm areas not freezing places.
Mike I would really like to see a link where this is recommended by a battery manufacturer. I can't imagine a scenario where this would not cause more harm than good.

Wherever oil touches the plates will prevent that area from participating in the exchange of electrons; permanently decreasing the capacity of the battery since there is no way to get the oil out once you put it in.

Totally not sure what Sulfuric Acid will do to the mineral oil or what chemical by products will be created in the reaction. Hydrogen gas could collect under the oil during the normal charge cycle and cause an explosion or fire when it build up enough pressure to "burp."

So let me know which manufacturer says this is a good idea... seriously.
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Old 06-29-2015, 10:37 PM   #33
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I did find this:

From Automotive Storage Battery Care and Repair by O.A. Witte

"Oil in the electrolyte, if allowed to get into the pores of the plates, will fill them and lower the capacity very much. It affects negative plates much more than positives. Probably the only remedy in this case is new plates."

I also found references to using mineral oil or vaseline jelly on the terminals to prevent corrosion from acid splashes coming through vented seriously discharged batteries when fast charging.

I only found RV chat room BS about putting it inside the batteries. Ugh. Bad advice is not better than no advice at all...
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Old 06-29-2015, 10:40 PM   #34
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it stays on the top of the water. .
Assuming the battery is on a flat stable non moving platform. I have not seen a TT that meets that criteria. As the TT bumps around, the oil will slosh around and coat some portion of the top of the plates rendering them useless.
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Old 06-29-2015, 10:47 PM   #35
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In one of the Marine threads I was looking at a fellow was recommending doing this in boat batteries. Just about everyone jumped down his throat about that very issue.

The oil will become "miscible" in the electrolyte and spoil the plates on the entire surface in short order due to the sloshing from boat movement.
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Old 06-29-2015, 10:52 PM   #36
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Not one to "Gild the Lily" (Yea right!), here is a vendor selling a product to replace "Mineral Oil".

While I would NEVER consider putting his "Snake Oil" in my battery, he makes a great case for why you should NEVER use mineral oil.

Battery De-Mister® vs. Mineral Oil - Therm Oil

I quote "... in order for a lead acid battery to function properly the battery must be able to breathe. When temperatures are quite cold mineral oils will become solid (place some in your freezer overnight and try to pour it from its container) this solid layer will inhibit proper venting. "
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Old 06-29-2015, 10:59 PM   #37
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herk you can keep bringing this up. This is my last reply to this thread. I am talking about WARM CLIMATES!!! Not this
When temperatures are quite cold mineral oils will become solid.
I am out
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Old 06-29-2015, 11:02 PM   #38
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I certainly wouldn't put mineral oil in a battery, but I guess you could theoretically add distilled water to displace the mineral oil SO LONG AS:

1. You left the battery sitting so there was no shaking to mix the mineral oil
2. You absolutely never let the mineral oil level reach the plates
3. You had no issues with completely overflowing the cells in order to get the mineral oil at and didn't mind about the sulfuric acid that would run everywhere when you attempted this.
I would give you about the same chance of being successful doing this as finding tofu that tastes like a ribeye! Oh....I still wouldn't rule out the hydrogen explosion someone else mentioned.
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Old 06-29-2015, 11:16 PM   #39
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Link to good info on 12 Volt RV systems:


The 12volt Side of Life (Part 1)
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Old 06-29-2015, 11:43 PM   #40
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You must have battery power to apply the trailer brakes IF there is a vehicle separations.
This is different from the brakes from the cab.
Hope this helps.
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