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Old 04-04-2017, 01:37 PM   #29
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RobRoy....see Thermoil.com.
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Old 04-04-2017, 01:55 PM   #30
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Had 10 6v Trojan batteries on the trawler we lived on. Had "battery miser" caps. Won't put them on my RV. That's all I'll say. Put oil in batteries on boat. They were 8 years old when boat sold, and all tested great. Oil in RV batteries now, and working great.
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Old 04-04-2017, 02:28 PM   #31
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Had 10 6v Trojan batteries on the trawler we lived on. Had "battery miser" caps. Won't put them on my RV. That's all I'll say. Put oil in batteries on boat. They were 8 years old when boat sold, and all tested great. Oil in RV batteries now, and working great.

and I was hoping to gather information as to the pro's and cons of most all the methods used to prevent battery cable/center corrosion issues.
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Old 04-04-2017, 02:38 PM   #32
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Originally Posted by Mike_Harriet View Post
Had 10 6v Trojan batteries on the trawler we lived on. Had "battery miser" caps. Won't put them on my RV. That's all I'll say. Put oil in batteries on boat. They were 8 years old when boat sold, and all tested great. Oil in RV batteries now, and working great.

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Old 04-05-2017, 03:57 AM   #33
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RobRoy -- Adding mineral oil is more about avoiding corrosion than having to add water, & it certainly does that --

Harry -- What is the brand of the battery polish you use ? I need to get some -- Bill Willard


Oh my Bill went there, I didn't say that! Lol. Bill that's the only thing I didn't see when at QZ! I haven't got as far to polish my gas cap covers yet![emoji12]
Love the fun Harry!
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Old 04-05-2017, 04:03 AM   #34
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Waiting to here others input on the Water Miser Battery Vent Caps


Rob I'm currently using them,, it work similarly to adding mineral oil, just reduces battery boil over if any and places it back into the cell. I installed them in January this year so I don't have enough data yet, but I checked this past weekend prior to our camping trip, cell levels are great. I use solar charger to keep my batteries charge while in storage.
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Old 07-27-2017, 09:00 PM   #35
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I decided to try adding 4 oz of mineral oil to each cell of my bait try bank last year and though I noticed a reduction in the frequency of needing to add water. I still check levels monthly. I also noticed much cleaner terminals.
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Old 07-28-2017, 07:13 AM   #36
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I decided to try adding 4 oz of mineral oil to each cell of my bait try bank last year and though I noticed a reduction in the frequency of needing to add water. I still check levels monthly. I also noticed much cleaner terminals.
Exactly - doesn't cure everything but it sure helps.
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Old 07-28-2017, 07:37 AM   #37
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Trying to understand. When you add your 4 oz oil to a cell, do you overfill the cell, or do you pull out water and add oil to the normal full level - that would be just below the inner ring?
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Old 07-28-2017, 09:57 PM   #38
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On a properly filled cell there is room for 4 ounces of oil. If your cells are already over filled you would have to wait for them to off gas enough.
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Old 07-28-2017, 10:03 PM   #39
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Please tell me that the gas can in the picture that you have stored next to the batteries contains something other than gasoline! Distilled water perhaps?
Distilled water only.
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Old 07-29-2017, 05:45 AM   #40
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Is it 4 oz (1/2 cup) of mineral oil per cell or per battery? A 12 volt battery has 6 cells, right? This would be 3 cups of mineral oil! I don't think I've ever added that much water to my batteries. I am leery to let them run that dry. I add maybe a cup of water every few months and it's usually to only a cell or two - not the same amount to all of them. How do I keep track of the amount of oil added to each cell until they all get their 1/2 cup?
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Old 07-29-2017, 05:59 AM   #41
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I think it depends on the size of the batteries. I am thinking of 2 oz to see how that goes but I have relatively small batteries compared to the folk with T series in their DP's.
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Old 10-09-2017, 03:13 PM   #42
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I think it depends on the size of the batteries. I am thinking of 2 oz to see how that goes but I have relatively small batteries compared to the folk with T series in their DP's.


Yes, but it was previously suggested in this thread that you add 2 ounces per cell for 12v battery and 4 ounces per cell for a 6 V battery. One should make sure that the electrolyte covers the plates per the manufacturers recommendation and no more. Then add your mineral oil. see Thermoil.com
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