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Can NiMH batteries be recharged using a normal AA charger?

Discussion in 'Misc Electronics' started by [email protected], Apr 27, 2005.

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  1. 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!
  2. CWatters

    CWatters Guest

    If it claims to be a fast charger for NiCad cells then it's not a good idea
    to use it with NiMH cells. If it's designed to trickle charge cells
    overnight then it might work ok.

    If your house burns down it's your fault though.
  3. Z80

    Z80 Guest

    My battery charger is marked "Universal Ni-Cd & Ni-MH" and its not that new or special, so I would guess that most chargers would be OK.
    Inside the unit, for AA batteries, it says Ni-Cd 500mAh - 5-8hrs Ni-MH 1200mAh - 10-20hrs
    It seems like trickle chargers would work - you just have to allow time for the capacity of the battery. (or cell).

  4. CWatters

    CWatters Guest

    Fast chargers designed for NiCad cells (only) should not be used on NiMH.

    The reason is because the end of charge voltage peak can be a lot lower
    sometimes with NiMH cells - this can lead to the charger failing to detect
    that the cells are full and fails to switch off. This leads to over charging
    at the fast charge rate and possibly very hot cells or worse.
  5. Please note charging overnight isn't "trickle" charging.
    Overnight is standard C/10 charging (for the original charger
    design cell capacity) although sometimes it can be as high as C/5.

    NiMh shouldn't be (true) trickle charged (<C/20) in any case.
    They may be never be charged fully or conversely depending on
    the charge and cells, overcharged and lose capacity.
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