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Ni-Cad Rejuvinator

Discussion in 'Electronic Design' started by g_no, Jan 27, 2006.

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  1. g_no

    g_no Guest

    I have an older VHS camcorder and the battery will not re-charge. I
    know that there are rejuvinators on the market for ni-cad batteries but
    they are only for standard sizes (AA, C, D, etc.). Does anyone have a
    circuit I can use to rejuvinate my 12vdc camcorder battery.
    Thanks!
     
  2. Pooh Bear

    Pooh Bear Guest

    There are ?

    Graham
     
  3. Mook Johnson

    Mook Johnson Guest

    Google it

    I believe you can pulse each cell with a high current pulse (charged up
    cap?) to burn away tiny dendrites that form fron low current use.

    Try "zapping NICADs" and you should get something
     
  4. Mark

    Mark Guest

    yes, you have to open the "battery" to get to the connection to each of
    the ten? "cells" inside...

    I rejuv cells by connecting them to a 12 V 10Amp supply for a few
    seconds.... they draw lots of current and clear out whatever is
    shorting them inside... then charge as normal...

    they work again , but never as well as orignally...

    Mark
     
  5. ehsjr

    ehsjr Guest

    Something like this:

    +V ---[R]---+ +--------+
    | | |
    | | |
    o o |
    SW \ [NICAD] *cell*, not pack
    o |
    | |
    [C] |
    | |
    Gnd -----------+-----------+

    Make C as big as you can, size R to limit inrush.
    Transfer the switch to discharge the cap into the
    cell.

    I experimented with this a whole bunch of years
    ago. As I *dimly* recall, I didn't get better results
    by increasing C beyond 36,000 uF, nor did I see
    any benefit going above about 24 V. However, those
    numbers might as well be pulled from a hat. The one
    number I do remember was a little better than 30 %
    "success". The problem was, that the success was
    very short lived. I was able to rejuvinate the
    shorted cells, but they would re-short in a couple
    of days. I ended up abandoning the thing as useless,
    and found a much better technique: buy new cells.

    Ed
     
  6. Joseph2k

    Joseph2k Guest

    That is only step 1. Next you deep cycle it a few times, paying attention
    to not overheat them. Finally charge them up slowly and leave on trickle
    for 3 hours.
     
  7. g_no

    g_no Guest

    Definitely! They are usually for specific types of batteries (AA, C,
    etc.). I need a circuit for more general use.

    g_no
     
  8. g_no

    g_no Guest

    Tried that with no success, thanks
     
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