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Thread: Will battery acid freeze?

  1. #1
    Join Date
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    Default Will battery acid freeze?

    I have a bottle of battery acid. It is NOT in a battery. If its left in the garage unheated and it gets to -20 F will it freeze?

  2. #2
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    "battery acid" is for the most part sulfuric acid.

    http://wiki.answers.com/Q/What_is_th..._sulfuric_acid


    Depends on the concentration.

    100% = 3C

    93% = -32C

    78% = -38C

    65% = -64C

    aren't internet searches fun!!!!!!!

    andy b.

  3. #3
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    Battery acid concentration in a battery is around 33% so the freezing point, interpolated from the above table, is quite low. Don't know what it might be in a jar.

    Never add water to sulfuric acid!

  4. #4
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    Don't know about the 'clean' never used acid itself, but do know that a discharged battery will freeze pretty easily, being fully charged seems to drop it's freezing point.

    Ken.

  5. #5
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    Quote Originally Posted by dp
    Battery acid concentration in a battery is around 33% so the freezing point, interpolated from the above table, is quite low. Don't know what it might be in a jar.

    Never add water to sulfuric acid!
    Interpolated? Extrapolated? For sure about the water and acid comment. While searching for data on battery use I found this chart.



    I'm more used to lead, tin curves. Usually the temp/freezing curve looks like an U of sorts.

    Clutch
    Last edited by clutch; 10-25-2008 at 05:54 AM.

  6. #6
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    Quote Originally Posted by kendall
    Don't know about the 'clean' never used acid itself, but do know that a discharged battery will freeze pretty easily, being fully charged seems to drop it's freezing point.

    Ken.
    This is because a discharged battery contains little acid......

    "charging" involves driving the sulphur from the plates into the water as acid with an electric current, "discharging" is the process of combining the acid with the plate material while getting an electric current out.

  7. #7
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    Seems that nobody actually answered your ask. If it is "plain old battery strength acid," it will NOT freeze at -20 F. Interestingly, a fully charged battery that is "cold soaked" to about -40F will not discharge at all. The battery itself is apparently not damaged and functions just fine when the temperature rises.

  8. #8
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    Thanks guys and thanks Duffy!!

  9. #9
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    This I think, has all the info.

    http://www.cdtechno.com/custserv/pdf/7953.pdf

  10. #10
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    THANKS RancherBill, So it appears that it would freeze at +28F . (note: the battery was "shorted" before the acid was removed)

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