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How to store NiCd batteries up to a year.

Discussion in 'Electronic Basics' started by Tibur Waltson, Jan 9, 2004.

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  1. I have many laptop and camera NiCd batteries that I charge and stash
    away. When I come back to use them half a year later they have no
    life. I recharge them, stash them away and they have no power again
    six months later. Will I kill my batteries by doing this to them? What
    happens if I completely drain them with a light bulb and stash them
    away for a year?
    TIA, Tibur
     
  2. If you don't need them, simply let them self-discharge. NiCds like to
    be stored in the discharged state, but there is no reason for you to do
    it. They're capable of discharging themselves. ;-)
     
  3. DarkMatter

    DarkMatter Guest

    Depending on temperature, they will lose charge over time.

    They don't lose capacity and merely need to be recharged.

    "Charge and stash away" doesn't work. You have to top 'em off every
    other month. Some more.

    You should use NiMH in your camera. Much better performer likely.

    Still loses charge over time and temperature though.
     
  4. Bob Myers

    Bob Myers Guest

    NiCds can be stored in any state of charge, but they WILL
    self-discharge and need to be recharged again before use
    after a long idle period. Just don't OVER-charge them., as this
    leads to the voltage depression phenomenon that is often
    mistakenly referred to as "memory."

    Intentionally draining a NiCd BATTERY (i.e., more than a
    single cell in series) through an external load below a certain point
    (as specified by the manufacturer, but usually the do-not-go-below
    limit is somewhere around 0.6V/cell or so) is NOT recommended,
    as it can lead to reverse-charging of one or more cells
    in the battery, which in turn can seriously damage that cell.


    Bob M.
     
  5. Ian Stirling

    Ian Stirling Guest

    Stick them in the fridge in a baggie, to greatly slow charge loss.
    Several times faster than NiCd.
     

  6. Not necessarily. Not all NiMH cells are designed alike. The same is also
    true of NiCd batteries. See the graph under the section titled "Storage
    characteristics" of this document:

    http://www.panasonic.com/industrial/battery/oem/images/pdf/Panasonic_NiMH_Overview.pdf

    I've got some 1450mA 'AA' Sanyo NiMH cells I stored in a flashlight for
    almost exactly one year in my car. After removing them I found they still
    retained an estimated 400mAh of capacity. I live in Phoenix, Arizona so
    heat was most certainly present for much of that storage period.
     
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