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NiCad Charging

Discussion in 'Beginner Electronics' started by John M Walker, Sep 28, 2003.

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  1. Hi.
    I have a question.
    I have a regulated 12v supply, 12v 700mAh NiCad pack.
    How do I trickle charge the Nicad pack.
    Have tried using a small resistor (400-600r) as a constant current source
    but the current drops off to .8ma as the pack voltage reaches 11.5 ish
    volts. Obviously the pack just discharges in minutes.
    Any ideas, or do I need to raise the supply voltage.
    Thanks.
     
  2. Spudley

    Spudley Guest

    Try using a charge circuit that contains a incandescent light globe in
    series with the supply current.
    The co-efficient properties of the Tungsten filament should provide a
    certain amount of current limiting as the battery is being charged.
    A 12 volt 5 watt car globe should be sufficient.

    HTH.
     
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