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Weird science and NiCad batteries

Discussion in 'Misc Electronics' started by [email protected], Feb 21, 2006.

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  1. Guest

    Hi all.

    OK, I am humming the "X files" theme here.

    I just did an experiment involving "nuking" a defective NiMH mobile
    phone pack.

    Interestingly, the voltage shot up from 4V (this was a 4.8V pack) to
    over 5.2V and the pack appeared to charge somewhat (it powered the
    phone for a while, and accepted a charge)

    My speculation is that somehow it fused out those dendrites on every
    cell (due to the high current flow) far more effectively than the
    usual tricks like applying high voltage pulses.

    Anyone have any insight on this?

    ....

    (DO NOT try duplicating this experiment, you risk the battery exploding
    violently scattering bits of metal at speeds exceeding that of a
    bullet, this is far more dangerous than "zapping" bad cells with a
    capacitor!!!!)
     
  2. Guest

    MW oven, 1 second, HIGH

    :)
     
  3. Bob Myers

    Bob Myers Guest

    What, exactly, did you do?


    Bob M.
     
  4. Bob Myers

    Bob Myers Guest

    In that case, I strongly suspect that this "nuking"
    did absolutely nothing significant, and any change
    you saw in the battery's behavior was
    coincidental.

    Bob M.
     
  5. Guest

    Think I'll get laughed at if I walk up to the network analyzer with a
    NiMH cell and say I want to measure S11?

    I guess it probably would be safe to do with a cap to block the dc...
     
  6. cbm5

    cbm5 Guest

    Hmm, you may be right, depending on the shape of the battery the RF may
    not have penetrated very far. Most likely would stay entirely on the
    outside of the metal can. But I guess beaming a few hundred Watts of RF
    into an electrical device MIGHT do something, I'd be tempted to try it
    if I had a dead NiMH and a microwave I planned to throw away, and a lot
    of bricks to pile around it.
     
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