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refreshing Ni- cad battery

Discussion in 'Power Electronics' started by Rolf, Apr 11, 2016.

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  1. Rolf

    Rolf

    2
    0
    Apr 11, 2016
    Hi members I have two ?s on Nicads // they seem to hv memory // so ihave heard they need to be fully
    discharged sometimes before recharging // if a person dischages a 5 volt nicad fully,,,, what voltage will it read
    //// also is there a recomended simple circuit to do this ?????? Thankyou
     
  2. Bluejets

    Bluejets

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    Oct 5, 2014
    Do not discharge below 0.8v per cell otherwise cell may not recover. Never seen a 5v nicad.....nominal voltage per cell is 1.2v.......fully charged it can reach 1.45v per cell.... Memory effect usually shows as reduced capacity BUT so does a faulty cell...... To recycle automatically look for nicad cycler
     
  3. Rolf

    Rolf

    2
    0
    Apr 11, 2016
    Thankyou Bluejets have 4 1.2 tied in series I will recharge at 3.2 volts:)TTY
     
  4. nlol

    nlol

    10
    1
    Apr 9, 2016
    Ah - no - you'll have to apply a voltage at least as high - and not much more - than their fully charged voltage. Itis better to do this individually. In series each will have a different resistence and voltage drop giving somewhat unmanageable results/charging for each battery. For the same reason, charging them in parallel is not a good idea. Someone else will have to advise you about charge rates but you should not simply charge them with a regulated power supply set at the maximum charge voltage. Doings so would almost certainly damage a deeply discharged battery.
     
  5. Alec_t

    Alec_t

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    Jul 7, 2015
  6. Bluejets

    Bluejets

    4,764
    999
    Oct 5, 2014
    The op was quoting his cutoff voltage NOT his charging voltage
     
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