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discharging nicad batteries???

Discussion in 'Electronic Repair' started by gothika, Aug 5, 2003.

  1. gothika

    gothika Guest

    I have some 9.6v nicad batteries for a cordless drill.
    What is the best way to completely discharge these before
    recharging?(I use a 12v tail light bulb for some 12v nicads but don't
    think that would work in this case.)
    I've seen a home brew box used to rapidly discharge badly formed
    nicads thereby restoring them to some usable state.
    Anyone know what it'd take to build one of these, or where I might
    purchase one?
    Thanks in advance for any assist.
     
  2. CJT

    CJT Guest

    I think it would.
     
  3. If you completely discharge the entire pack, it will probably be damaged and
    unusable since some cells will have been reverse charged in the process.

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  4. Jerry G.

    Jerry G. Guest

    Use the 12 volt lamps. They will be of adequate load. You do not want
    to overload the batteries as well. Never discharge NiCads fully. They
    can be put down to about 40% below nominal, to have a proper discharge.
    If you fully discharge them, they can also be damaged.

    I use my drill to do the job. I turn the drill on in the lock position,
    and leave it sit until it just about stops. Then I charge the battery
    pack.

    NiCad batteries will last about 2 to 3 years average, if used moderate
    to light. They will last even less with a lot of heavy use. It is a
    combination of age and charge cycles that wear them out. As they age,
    they also degrade in their chemical makeup. There is no way out.

    --

    Greetings,

    Jerry Greenberg GLG Technologies GLG
    ==============================================
    WebPage http://www.zoom-one.com
    Electronics http://www.zoom-one.com/electron.htm
    Instruments http://www.zoom-one.com/glgtech.htm
    ==============================================
    I have some 9.6v nicad batteries for a cordless drill.
    What is the best way to completely discharge these before
    recharging?(I use a 12v tail light bulb for some 12v nicads but don't
    think that would work in this case.)
    I've seen a home brew box used to rapidly discharge badly formed
    nicads thereby restoring them to some usable state.
    Anyone know what it'd take to build one of these, or where I might
    purchase one?
    Thanks in advance for any assist.
     
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