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Old 02-07-2016, 06:59 PM   #1
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House batteries low on acid

After checking my house batteries I saw that all cells are nearly dry. My question is do I fill the cells with pure battery acid or do a mixture of acid and water?
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Old 02-07-2016, 07:03 PM   #2
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Use distilled water to refill. If the batteries got too low they could be permanently damaged.
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Old 02-07-2016, 07:45 PM   #3
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Never Never add acid. Only Distilled Water.
You should be checking your batteries on a monthly basis until you get and idea of the interval required to top off the water. Letting the water run below the plates will shorten battery life.
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Old 02-07-2016, 08:08 PM   #4
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How long since last checked? If recent and they are now dry check for over charging. But sounds like has probably been awhile or a new to you RV.

Distilled water only. Check at least monthly. Ensure your charger is working.
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Old 02-07-2016, 08:12 PM   #5
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Some battery bedtime reading for you.

RV 101 – RV Battery Charging Basics | RV 101 your education source for RV information
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Old 02-07-2016, 08:20 PM   #6
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Well, I guess I need to stupid thing. I filled one of the cells completely up with battery acid and it took quite a bit. I was going to buy more battery acid for the rest. I'm glad I asked on this forum about battery acid. Now I just need to figure out how to get the battery acid out of the one that I filled.
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Old 02-07-2016, 08:24 PM   #7
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Use a hydrometer and suck out as much as you can.
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Old 02-07-2016, 09:50 PM   #8
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Plug the other holes with corks and dump it out.
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Old 02-07-2016, 09:52 PM   #9
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If you have undiluted battery acid, it is very dangerous. I would suggest you dispose of it. The only time I ever used it was in the army to put in the new batteries after it was diluted. That's mean stuff. The new battery cells were empty.
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Old 02-07-2016, 09:57 PM   #10
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Quote:
Originally Posted by Grey Ghost I View Post
If you have undiluted battery acid, it is very dangerous. I would suggest you dispose of it...
X2. If you splash any in your eyes or exposed skin, the cost of a new battery will seem like a bargain. At the very least, wear goggles and rubber gloves.
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Old 02-07-2016, 10:06 PM   #11
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Well, I guess I need to stupid thing. I filled one of the cells completely up with battery acid and it took quite a bit. I was going to buy more battery acid for the rest. I'm glad I asked on this forum about battery acid. Now I just need to figure out how to get the battery acid out of the one that I filled.
Dumping it out is not the real answer either as it had the correct old concentrated whatever waiting to get diluted back to the proper concentration with pure water.

I'd try sucking out as much as I could get then add distilled water to it and the rest. Then charge and see what happens. Save what you suck out in a glass bottle for now. If the battery takes a charge you can try it. Do not be surprised if it does not or if what it takes does not last long. Assuming you let it slowly dry over time the lead that was exposed gradually changed the surface chemical composition so it may not react properly to take a charge. I'd try what I could but be thinking new batteries. YMMV. Good luck with it.
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Old 02-08-2016, 09:17 AM   #12
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You fill with DISTILLED WATER.. The water evaporates the acid salts do not.
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Old 02-08-2016, 10:25 AM   #13
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Standard battery acid is ~35% sulfuric acid solution when added to a new battery. What you added is probably that concentration, it should be stated on the container. I doubt you did any harm to your battery.
DO NOT dump onto the ground, instead,collect and dispose of as stated in the MSDS for sulfuric acid.
ALWAYS WEAR EYE PROTECTION when handling any acidic or alkaline materials!

You must have a chemical license to buy high concentrations of this class of acids due to dangers involved.
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