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NiMh charging method

Discussion in 'Electronic Basics' started by Rob Horton, Sep 25, 2003.

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  1. Rob Horton

    Rob Horton Guest

    Hi,

    I'm thinking of adding a battery backup system to a project of mine. I will
    be using a NiMh battery pack of 7.2v with a capacity of 1.8Ah.

    To keep things simple and cheap, I was thinking of leaving the battery
    permanently connected to a trickle charge of about 18mA (1.8A / 100).

    What I would like to know is:

    (1) If the battery is in an initial discharged state, will the trickle
    charge eventualy fully charge the battery?

    (2) Can I really leave the battery permanently connected to the trickle
    charge?

    Thanks.

    Rob Horton.
     
  2. James Beck

    James Beck Guest

    The quick answer is IT DEPENDS.
    I doubt very seriously that .01C is going to bother the battery as a
    trickle charge. Now, if the system drain or self discharge rate is
    greater than the trickle rate then the battery will eventually go dead
    or never charge. I would say, try it and see. At that rate I can's see
    you hurting it.

    Jim
     
  3. JeB

    JeB Guest

    I'm guessing you can find an IC "smart charger" that will handle the
    details for you.
     
  4.  
  5. John Fields

    John Fields Guest

    ---
    Note from:

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

    that trickle charge is _not_ recommended.

    Since the chemistries will be similar regardless of manufacturer, I
    suspect the charging characteristics will also be similar. To be sure
    though, you need to find out from the manufacturer of the cells.
     
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