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long term trickle charging NiCad batterys

Discussion in 'Electronic Basics' started by Keith Soldavin, Jan 30, 2004.

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  1. I have an application where I am using a two cell 2300 mAh NiCad
    battery as a backup power supply for a sensor. The system will be out
    in the field and running off AC power most of the time but when the
    power is disconnected that battery will keep the system alive. I want
    to be able to recharge the battery and keep it maintained but I am
    trying to avoid a smart charging system. Would it be OK to constantly
    trickle charge the battery at a rate of around C/50 and not risk
    overcharging? I'm not concerned about how long it will take to
    recharge the battery nor am I concerned about shortening the battery
    life significantly. I doubt this will be used for longer than a year
    before the entire system is replaced. If the C/50 rate is not
    appropriate then what charge rate would be acceptable for my
    application?

    Thank you
    Keith
     
  2. A SLAC is likely a better solution than NiCd for this application, as
    long as when they're used you don't discharge them to zero. SLACs love
    to be left on float for years.
     
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