Can NiMH batteries be recharged using a normal AA charger?

Discussion in 'Digital Photography' started by deepaa, Apr 27, 2005.

  1. deepaa

    deepaa Guest

    Wondering if I need to buy a NiMH charger for NiMH rechargeable AA
    batteries or a normal AA charger will work with the NiMH batteries. Can
    anyone tell me if this is possible?

    Thanks in advance!
     
    deepaa, Apr 27, 2005
    #1
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  2. deepaa

    Paul Rubin Guest

    Buy a NiMH charger.
     
    Paul Rubin, Apr 27, 2005
    #2
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  3. deepaa

    Mark² Guest

    Nice troll.

    Just in case you're serious... You need an NiMh charger...and also to read
    the package your batteries came in.
     
    Mark², Apr 27, 2005
    #3
  4. deepaa

    imbsysop Guest

    well actually you don't :) .. but only if .. you are not in a hurry
    and you don't care about possible battery damage .. :) :)
     
    imbsysop, Apr 27, 2005
    #4
  5. deepaa

    Dave Cohen Guest

    The answer to your question is definitely yes. However, my son and his
    friends have replaced the 'permanent' NiCD's in an electric razor with NiMH
    and they seem to be ok using the original charge method. Probably takes
    longer to charge.
    Dave Cohen
     
    Dave Cohen, Apr 27, 2005
    #5
  6. There is no such thing as a "normal AA charger". Chargers are
    specific to battery technologies -- nickel cadmium, nickel metal
    hydride (those two can often share a charger, at least if it's
    designed for that), lithium ion, rechargeable alkaline, lead acid,
    gell cel, whatever.

    If your charger doesn't say it's for NiMH batteries, it most likely
    isn't.
     
    David Dyer-Bennet, Apr 27, 2005
    #6
  7. deepaa

    meow Guest

    Most "NORMAL" AA chargers were for rechargeable NiCad's. They typically
    supply about 10% of the batteries current or less into a NiCad 1.2v at a
    constant current and take approx 12-14 hours per charge. They work perfectly
    fine for Nimh, although the higher the current rating of the Nimh the longer
    it takes to charge. Read the charging requirements of any Nimh. The newer
    Nimh chargers are made to pump much larger currents into a Nimh which heats
    up the battery, but will charge them faster, a decent charger monitors the
    temp and shuts down the current. Heating up a battery WILL shorten its life.
    So as a matter of fact a slow charger will lengthen the life of a Nimh
    battery. A Lithium Ion battery needs a constant Voltage charger. They can
    NOT be charged on a "Normal AA" charger.
     
    meow, Apr 29, 2005
    #7
  8. deepaa

    David Chien Guest

    In an emergency, and if you're careful, yes. But because the normal AA
    chargers (meaning NiCd typically) aren't designed for the charge
    characteristics of a NiMh cell, you may encounter situations where the
    cell overheats, catches on fire, etc. You can manage the charge cycle
    yourself - have to get the cell charge tech. details, the charger
    current & operation details, etc. - and calculate how long you can keep
    a cell in the charger safely, but it's much better to buy either a cheap
    NiMh charger (see www.fatwallet.com/c/18/ for these) or upgrade to the
    world's fastest - 15 minute Rayovac AA NiMh charger at Walmart stores.
     
    David Chien, Apr 29, 2005
    #8
  9. deepaa

    james Guest

    Two words for you:

    Maha.

    Powerex.
     
    james, Apr 29, 2005
    #9
  10. deepaa

    imbsysop Guest

    IMHO that is very unlikely as most AA chargers I know of are using charge
    currents which are barely higher than the trickle charge current for NiCd's
    or NiMH's ..
     
    imbsysop, Apr 30, 2005
    #10
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