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Can NiMH batteries be recharged using a normal AA charger?

Discussion in 'Electronic Basics' started by [email protected], Apr 27, 2005.

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  1. Guest

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

    Thanks in advance!
     
  2. mike

    mike Guest

    What is a "NORMAL" AA charger???
    Absent any useful information...it's prudent to charge batteries with
    the charger designed to charge them.
    mike

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  3. cpemma

    cpemma Guest

     
  4. cpemma

    cpemma Guest

    Not according to
    http://www.starbatteries.com/chargerfaqs1.html#Can I use my older NiCD

    "Can I use my older NiCD battery charger to charge my NiMH batteries?
    No, you can use a newer NiMH charger to charge your old NiCD batteries but
    you should not try to charge NiMH batteries with a NiCD charger. Here's why:
    NiMH and NiCD batteries are chemically very similar and when both are fully
    charged the battery voltage will start to drop. The NiMH voltage drop is
    much more subtle and more difficult to detect. NiMH chargers usually have an
    overtemperature sensor and shutoff to prevent overcharge as well as a more
    sensitive voltage drop detector where NiCD chargers usually only use the
    voltage drop to determine when to stop charging. If you charge NiMH
    batteries in a NiCD charger it will probably miss the voltage drop and keep
    right on charging causing the batteries to overheat. Overcharge and
    overheating NiMH batteries can damage them internally and reduce battery
    life."

    You'll also find a new charger will be better geared to the higher
    capacities usual in NiMH.
     
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