Way to revive tired gel-cell batteries?

Discussion in 'Electronic Basics' started by JakeD, Feb 21, 2008.

  1. JakeD

    JakeD Guest

    I have acquired some 12v gel cell batteries, some of which have been
    left in an almost discharged state for several months, and don't seeem
    to be charging up readily. I vaguely remember hearing some tips on how
    to breath new life back into such batteries. I think the advice was to
    charge rapidly, then completely discharge quickly, and repeat several
    times. And another trick I think I heard was to put the battery
    charger leads on the wrong terminals momentarily. I vaguley remember
    that this was supposed to blast something or other off the plates.
    Does any of this sound plausible?

    Thank you,

    JD
     
    JakeD, Feb 21, 2008
    #1
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  2. JakeD

    Ecnerwal Guest

    In article <>,
    JakeD <> wrote:

    > I have acquired some 12v gel cell batteries, some of which have been
    > left in an almost discharged state for several months, and don't seeem
    > to be charging up readily. I vaguely remember hearing some tips on how
    > to breath new life back into such batteries. I think the advice was to
    > charge rapidly, then completely discharge quickly, and repeat several
    > times. And another trick I think I heard was to put the battery
    > charger leads on the wrong terminals momentarily. I vaguley remember
    > that this was supposed to blast something or other off the plates.
    > Does any of this sound plausible?


    Not for lead-acid gel cells. IMHO you may be scrod with abused
    gel-cells. Here's some info from a place that deals with a lot of
    batteries.

    http://www.windsun.com/Batteries/Battery_FAQ.htm#Gelled electrolyte

    You might (and might not) get some benefit out of using a desulphator on
    them. Can be bought or built. More typically useful on liquid acid
    batteries, but possibly worth a shot - on the other hand, you can get
    "good used" batteries for not a lot of money, e.g. from
    www.allelectronics.com (not even a customer, but have them in my list of
    places that have stuff I've looked at - notably, fixed low shipping,
    which counts for a lot when ordering heavy batteries).

    The original article now seems to be on a pay to view basis, but here's
    a derivative article:

    http://www.geocities.com/yosemite/2358/e_electrical_tips/e04.html

    For nicads, "zapping" them with a big capacitor can be beneficial to
    blow off dendrites that form and short out the plates. Does not restore
    full capacity, but can restore some useful capacity to cells that had
    reached uselessness - ie, won't take a charge at all - zap, get perhaps
    1/2 original capacity. I've done that repeatedly with some drill
    batteries. Always in correct polarity - I can't see any benefit to
    reverse - sometimes abused cells reverse, but that's NOT a good thing.

    --
    Cats, coffee, chocolate...vices to live by
     
    Ecnerwal, Feb 21, 2008
    #2
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  3. JakeD

    JakeD Guest

    On Thu, 21 Feb 2008 21:55:55 GMT, Ecnerwal
    <> wrote:

    >Not for lead-acid gel cells. IMHO you may be scrod with abused
    >gel-cells. Here's some info from a place that deals with a lot of
    >batteries.
    >
    >http://www.windsun.com/Batteries/Battery_FAQ.htm#Gelled electrolyte
    >
    >You might (and might not) get some benefit out of using a desulphator on
    >them.


    Thank you very much for the links and suggestions. Extremely helpful -
    many thanks...

    JD
     
    JakeD, Feb 22, 2008
    #3
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