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Can a Nicad charger be used for NiMH batteries?

Discussion in 'Power Electronics' started by SimonP, Sep 13, 2009.

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  1. SimonP

    SimonP

    3
    0
    Sep 13, 2009
    Hi, I'm new to this site. I have some NiMH AA batteries for my camera. Can they be charged with my old Nicad charger? I've tried it, but the charge doen't seem to last long. Have I not charged them enough, or charged too long and damaged them?
     
  2. neon

    neon

    1,325
    0
    Oct 21, 2006
    not all chargers or battery are created equal. ltium is the hardest to charge
     
  3. SimonP

    SimonP

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    Sep 13, 2009
    What's Itium? - is it the same as Lithium (with alcohol added)? This is a serious question about Ni-Metal Hydride batteries in a Nicad charger - I'm not sure we're on the same page here!
     
  4. Resqueline

    Resqueline

    2,848
    2
    Jul 31, 2009
    The answer depends on the complexity of your old charger. It might be non-timed, timed, or a fast charger with negative delta V termination. The last one is not at all suited for Ni-MH batteries which needs a more neutral delta V termination as well as a sufficiently high charging currrent in order to achieve a reliable charge termination.
    With the first two you'll need to calculate the neccessary extra charging time, due to the much higher capacity of the Ni-MH technology. If your batteries are 2000mAh then you'll need to charge them four times longer than their 500mAh NiCd counterparts.
    If your batteries lose their charge by just lying unused for a week or two then they might be damaged or worn out, and there's nothing to do about it other than charging them immediately before use.
     
  5. SimonP

    SimonP

    3
    0
    Sep 13, 2009
    It's a basic Radio Shack NiCad charger that would normally take 18 hours to charge 500mAh batteries. The NiMH batteries are new so I guess I just haven't charged them long enough. I'll check the charging current next time I put them in, and adjust the charging time accordingly. Many thanks for your help.
     
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