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Lead Acid Battery(gel Type) Getting Fat And Losing Its Capacity To Hold Charge

Discussion in 'Power Electronics' started by Akbar, Jan 31, 2017.

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  1. Akbar


    Jan 27, 2017
    i would like to know how its happening ,how to prevent it ?
    the battery was a deep cycle 12 v 20 ah battery used in e bike.
    now i notice 4 of them got fatty.but one still working it okey to keep the one working fine with new batteries ?
  2. davenn

    davenn Moderator

    Sep 5, 2009
    that's because it has been getting hot due to over charging .... use a proper charger suitable for that battery

    it's not a good idea to mix old and new batteries, regardless of their type
    for reliability, I would be buying 4 new batteries

    You will find the old one that has bulged may be still working OK at the moment .... but it's life will have been severely shortened
    and it wont be long till it finally fails
    HellasTechn likes this.
  3. HellasTechn


    Apr 14, 2013
    I dont think it is a good idea to keep them. Also i am not sure what chemical reaction goes on inside them that make them "fat" as you say. Best thing to do is to charge them periodically like once every month for a few hours to make sure that their voltage never drops below 12V.
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