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Small AGM question.

Discussion in 'Home Power and Microgeneration' started by Daniel Armstrong, May 2, 2006.

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  1. I have a 17/20AH battery that I had connected to an APC Back-UPS Pro 650VA
    (stock battery is 11AH) and one day I had the UPS do a battery self test and
    it indicated a bad battery so I replaced it with another of the same
    capacity out of my Xantrex Xpower 300C. I tested the bad one and determined
    that it had developed a bad cell. The symptoms are that cell 2 gets hot and
    gasses (rotten egg smell) whenever a load is connected.
    - +

    How often do AGM batteries develop a bad cell in constant 13.8 float and
    what type of fault is it likely to be? I know the charge controller in the
    UPS is OK because when I got it used and replaced the bad stock battery that
    was in it (died due to sulphating) I left my multimeter connected for a week
    and it stayed rock solid at 13.8 the entire time.
  2. Pooh Bear

    Pooh Bear Guest

    Given that they use the same chemistry ? surely not ?

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