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Thread: Tank Circuit: SLA's cannot be stored below freezing temperatures?

  1. #1
    FLAC
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    Tank Circuit: SLA's cannot be stored below freezing temperatures?

    Hi.
    So I was reading through buchmann.ca and I came across this interesting statement:

    "The SLA cannot be stored below freezing temperatures. Once a pack has been frozen, it is permanently damaged and its service life is drastically reduced. A previously frozen battery will only be able to deliver a limited number of cycles."

    Source: http://www.buchmann.ca/Chap15-page2.asp (scroll to the bottom)

    Can anyone confirm this statement? Does this apply only to sealed lead acids since normal car batteries manage just fine in below freezing temperatures? I am concerned because I just built a tank circuit with a 4Ah SLA and if this statement was true, then it probably wouldnt be any use in the winter-time.

  2. #2
    Low Bitrate
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    Usually its a bad idea to dischare an SLA at anything below -4F (-20C), or charge it at anything lower than 5F (-15C). Ideally they work best at 68F - 72F (20C to 25C) both discharge and charge. But in a car the same would apply @ heat. They don't like to be charged at higher than 122F (50C) or discharged higher than 140F (60C).

    Running them too cold results in physical plate breakdown and damage. Running them too hot results in an accelerated drying up the chemicals in the battery, and shorter life span. They may also swell when too hot.

  3. #3
    FLAC
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    Thanks for your reply. With so many people using SLA in their tank circuit, I'm assuming atleast some of them live in very cold temperatures (it gets down to -40C in the winter where I live). But since my SLA only has to provide a very brief discharge (only used during crank) and therefore would only be charged very briefly, should I worry? Perhaps I need to make a heater...

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