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charging ni-mh batteries , question

Discussion in 'Electronic Basics' started by paul.g7izx, Jul 19, 2003.

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  1. paul.g7izx

    paul.g7izx Guest

    I have a Question , Ref: charging Ni-Mh
    I have done a little bit of research on this subject ,
    but still haven't found out what I needed to know

    I Normally charge my > Nicads < on a Power-supply
    which has a fully variable Current ( or Current Limiting ) if you like
    and fully variable Voltage Output & its output is DC & Fully Smooth
    When viewed on a scope . I fully understand the maths , Volts , mAh and
    time , = charge times etc

    But my actual question is should I be able to charge my 2000Mah
    Ni-Mi ? With my Power supply as described above .

    Or should it have a little Ripple etc ?

    ( As I have read that most modern charge have 2 settings on them
    one switch position is to charge Ni-cads the other for Ni-Mh
    , ** But it was Suggested that it not only does it changes the charge
    it increases or decrease the time the batteries are charged and uses the
    auto cut-off ,
    It some-how also prevents hydrogen build-up within the cells while charging
    all of which is fully understandable , but the bit I don't understand is
    it states that it also changes the method of charging
    ** Now what the last bit referes to I don't know maybe it means more or less
    when charging )

    any ideas welcome

    thanks de Paul
  2. David Harmon

    David Harmon Guest

    The most important thing about charging a battery is knowing when to
    stop. A little ripple in the supply will not harm the battery, and it
    will not help the battery. But it may make it much harder to know when
    to stop charging, if you are using a voltage sensing method.

    A large ripple may cause extra heating of the battery, not good.
    The last bit means it uses a different method to decide when to stop.
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