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Nicad charger

Discussion in 'Hobby Electronics' started by Gingre, Jun 25, 2007.

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  1. Gingre

    Gingre Guest

    Hi all. Have just ordered a 9.6 volt nicad for My FT50 Yaesu transceiver. Is
    it OK to charge it on 12 volt (DC of course!) or will it overheat?
  2. Phil Allison

    Phil Allison Guest

  3. Gingre

    Gingre Guest

    Yes but what constitutes a "proper" charger? It can't be "what the
    manufacturer recommends or sells" and anyway in this case the manufacturer
    doesn't sell them any more. It must either be a voltage or current
    characteristic. So could you be more specific about this?
  4. Andy Wood

    Andy Wood Guest

    .. . .
    Often also cell temperature.

    Andy Wood
  5. Mr.T

    Mr.T Guest

    It depends simply on how fast you want to charge it. If you want a fast
    charge then you need to control voltage, current, AND cell temperature.
    If the charge is slow enough, you only have to worry about current. That
    usually means 24 hours or more though.

  6. Gingre

    Gingre Guest

    Yeah and time... But not many chargers for general use have temperature
  7. Mr.T

    Mr.T Guest

    Any decent rapid charger does. But you are correct in so far as most cheap
    "general use" chargers are slow types that will almost certainly not have
    temperature sensing.

  8. Tony

    Tony Guest

    If it would be an old fashioned standard NiCad and you don't know
    anything more specific, assume that the charge has to be
    14 hrs at 10% of the capacity, when fully discharged.
    i.e. a 1 Ah Cell will be charged with 0.1A for 14 hrs.
    10% current of this again, can be safely applied as trickle charge 24/7
    to keep the battery full and ready to go (1% of capacity).
    Your battery has 8 cells with nominal 1.2V*8 = 9.6V. When fully charged
    it will have 8*1.4V = 11.2V
    Measure the current when fully charged with 12V applied. If it is like
    the trickle charge (about 1% of capacity) you could just switch a light
    bulb in series that has about the power of 2.4V*[10%of capacity].
    It will act as a constant current source over a fair time of the
    charging process, and also as a current limiter.
    Make sure that your power supply is rated for your charging current.


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