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Nicad and nimh charging specifics?

Discussion in 'Beginner Electronics' started by Daniel Morrow, Oct 14, 2003.

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  1. Hi I thought I would try a new subject. Could someone tell me standard
    charging specifics for nicad or nimh batteries, trickle and/or
    otherwise? Also, is it possible to overcharge these batteries by
    trickle charging them? Thanks.
     
  2. happyhobit

    happyhobit Guest

    Hi Daniel,


    Trickle Charging

    Constant current charge at 1/10 C for 12 to 14 hours. C = capacity of
    battery. For a 1500 mah battery you would charge at 150 ma for 12 to 14
    hours.

    Yes you can over charge a battery at a trickle rate. After the battery
    reaches Full Charge the excess current will start cooking the battery. If
    the battery is getting hot, it's cooking.


    Peak Charging

    NiCad
    Constant Current charge at 1C until the charge voltage drops by 15 mv per
    cell.

    MiMh
    Constant Current charge at 1C until the charge voltage drops by 5 mv per
    cell.

    Some Peak Chargers monitor the battery heat for the reasons noted above.


    I suppose you could build a charger based on battery temperature rise.


    Jay
     
  3. Thanks happyhobit and Steve.
     
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