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Thread: Old cell, new kind of sorry death.

  1. #1

    Default Old cell, new kind of sorry death.

    Hi,

    I found an old cell, an Energizer 2500.
    I thought nothing of it, other than put it on a break in cycle on my c9000 and see what happens.

    Initial voltage around 0.5V, but once charging all looked well. After some 600 minutes into it i had to leave, voltage was around 1.42. Came back once it was 800 minutes into the cycle and the cell was hot as anything, really hot, and voltage showed a whooping 0.3V! 😀

    Took it out and let it rest. Put it in for a discharge, which ended at once. 0.3V.

    That cell just absolutely Died. First for me in this way.

    Any thoughts as to the chemistry behind this?

  2. #2

    Default Re: Old cell, new kind of sorry death.

    Just as further info. The cell didn't trigger a high reading at first. After 800 minutes of a break in cycle it comes out at 2.25 before high. Never had a cell Die mid charge. 😊

  3. #3
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    Default Re: Old cell, new kind of sorry death.

    Hello SweD,

    Sounds like something may have shorted inside the cell. While this is rare, it does happen.

    Tom
    Behind every Great man there's always a woman rolling her eyes...

    Most batteries don't die - they are tortured to near death, then murdered...

  4. #4

    Default Re: Old cell, new kind of sorry death.

    Apparently so. Whilst not being a Cell expert, I'm well and old enough versed in general electronics to spot a short, I thought as much. But in a cell? Like... what the heck, how did that happen?

  5. #5
    Silver Moderator
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    Default Re: Old cell, new kind of sorry death.

    Hello SweD,

    With Ni-Cad chemistry it was caused by dendrite formation piercing the separator. It is believed something similar happens in Ni-Mh although I have never been able to find out the exact chemical reaction involved.

    Tom
    Behind every Great man there's always a woman rolling her eyes...

    Most batteries don't die - they are tortured to near death, then murdered...

  6. #6

    Default Re: Old cell, new kind of sorry death.

    Thanks Tom, for your insight. 😊
    Have been here for many years and it feels reassuring to know that there are things even you don't know. 😊

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