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  1. #1
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    refilling battery cell.....use water or acid?

    I took the batteries (Everstart brand) out for winterization and noticed that each battery has one cell that is low on acid. If I use the leftover acid from when the battery was initially filled this summer will it hurt the battery? I was always taught to use distilled water when filling battery cells but since I still have some acid could this be used instead?

    Just curious. Besides, this would be a good place to dispose of the leftover acid.
    You can fix anything with a big enough hammer and plenty of money.

  2. #2
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    Im going to assume that its sulphuric acid that youre refering to. Ive always used distilled water myself, but from what Ive read, I dont think that using acid will hurt the battery. Keep it on a battery tender after you fill it and it should be fine.

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  3. #3
    PWCToday.com Is My Home Away From Home BigKahuna's Avatar
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    do not add acid, distilled water.

  4. #4
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    Quote Originally Posted by CaptnKirk
    Im going to assume that its sulphuric acid that youre refering to. Captn---
    It's the acid supplied by the manufacturer when the batteries were purchased. I'm pretty sure that it's sulphuric acid.
    You can fix anything with a big enough hammer and plenty of money.

  5. #5
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    Quote Originally Posted by BigKahuna
    do not add acid, distilled water.
    OK, thanks.......but would you explain why not use the acid?

    Not trying to be a pain, just curious.
    You can fix anything with a big enough hammer and plenty of money.

  6. #6
    resident guru JetEd73's Avatar
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    the acid you use when brand new contains water, you added watered down acid to being with and the reason that one cell is low is because the water boiled or evaporated out, they don't lose acid just the water sooooo....you just top them up with water.



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  7. #7
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    Quote Originally Posted by JetEd73
    the acid you use when brand new contains water, you added watered down acid to being with and the reason that one cell is low is because the water boiled or evaporated out, they don't lose acid just the water sooooo....you just top them up with water.
    Thanks.......I suspected something like this but chemistry was a loooonng time ago and thought I'd better ask someone elses advice. I gather from what you tell me that adding additional acid would be "too much" acid and probably have ill effects on the life or performance of the battery.

    I assume that adding distilled water simply adds enough hydrogen and oxygen to return normal function to the cell.
    You can fix anything with a big enough hammer and plenty of money.

  8. #8
    KDog
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    You should be able to buy already mixed sulphuric acid from an auto shop. Usually the mix is around 10% - 15% acid to pure water.

    You can add this or distilled water, NEVER add tap water.

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