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#1 (permalink) Old 02-05-2011, 10:25 AM
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Adding battery Acid or Distilled water

I've always added distilled water to low cells, but would it be better to go get acid from auto parts store and fill with that?
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#2 (permalink) Old 02-05-2011, 06:49 PM
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It's better to use distilled water.
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#3 (permalink) Old 02-05-2011, 09:43 PM
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Distilled water and don't overfill.

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#4 (permalink) Old 02-05-2011, 10:25 PM
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Re: Adding battery Acid or Distilled water

Quote:
Originally Posted by newyota
I've always added distilled water to low cells . . .
You've always been right.
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#5 (permalink) Old 02-05-2011, 10:31 PM
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Dr Dyno and the Old Bird are mostly right with their advice, too.

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#6 (permalink) Old 02-06-2011, 12:26 PM
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As the others said, add distilled water ONLY.

Battery electrolyte should be maintained at 65% water and 35% sulphuric acid. When the water evaporates, it leaves a greater concentration of acid, so if you add more electrolyte, the percentage is upset and the battery will not function correctly.

The only time you should add electrolyte is to a brand new battery that has never been filled before.

It's actually my sister's, but I'm the family wrench.
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#7 (permalink) Old 02-06-2011, 01:27 PM
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Quote:
Originally Posted by RF Overlord
Battery electrolyte should be maintained at 65% water and 35% sulphuric acid.
Do you happen to know how much the concentration varies from dead to fully charged as measured by a hydrometer?

BTW, How'd you come up with the username?
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#8 (permalink) Old 02-06-2011, 06:51 PM
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The electrolyte in a fully charged battery will read approx 1.265 on a hydrometer. A battery is considered fully discharged when the reading is approx 1.12. This would correspond to a percentage of sulphuric acid of about 15%.

Please note that all these numbers are approximate. Some sources give the percentage of acid as 33.5% and different manufacturers specify the SG of pure sulphuric acid as anywhere from 1.835 to 1.850.

As for my user name, it's a very boring story, but basically it was given to me by a colleague in the telecom field about 12 years ago. (RF is shorthand for "radio frequency")

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#9 (permalink) Old 02-07-2011, 03:06 PM
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Quote:
Originally Posted by RF Overlord
The electrolyte in a fully charged battery will read approx 1.265 on a hydrometer. A battery is considered fully discharged when the reading is approx 1.12. This would correspond to a percentage of sulphuric acid of about 15%.
Apparently some people think that since charging raises the concentration, simply adding acid would do the same thing. They forget the processes that must occur on the plates while charging.

Quote:
Originally Posted by RF Overlord
As for my user name, it's a very boring story, but basically it was given to me by a colleague in the telecom field about 12 years ago. (RF is shorthand for "radio frequency")
Yeah I knew what the "RF" was, I just wondered if you were one of those guys into putting multiple alternators on their cars to power RF amps for CBs radios to try reaching other planets!
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#10 (permalink) Old 02-08-2011, 11:03 AM
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Quote:
Originally Posted by Dr. Dyno
I just wondered if you were one of those guys into putting multiple alternators on their cars to power RF amps for CBs radios to try reaching other planets!
No, my tinfoil hat blocks the signal...

My favourites are the ones with $5,000 dollars worth of audio equipment in a $3,000 dollar Civic. You know the kind...the ones with $40 apiece gold-plated battery terminals and multiple 1 farad capacitors.

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