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RC 3 wire battery charging

Discussion in 'Power Electronics' started by Lurch180, Nov 20, 2018.

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  1. Lurch180


    Aug 16, 2017
    Hi, can you please help me sort this battery charging problem.
    My grandson has lost the charger for his RC car.
    I am a little confused with how to charge it, it has three wires.
    It has a Red, Black and a Blue.
    It is a QL NI-CD AA 700mAh 9.6V
    I am unable to find a charger for it online, in the usual places.

    I have put a DVM across the pins and I am getting
    9.2V across Red and Black with the Red one being +ve
    2.6V across Red and Blue with the Red one being +ve
    6.6V across the Blue and Black with the Blue one being +ve

    Any advise on buying a charger or how to connect one to the 3 pins will be greatly appreciated.

    Thank you
  2. Harald Kapp

    Harald Kapp Moderator Moderator

    Nov 17, 2011
    I assume that this is a 9.2 V pack (red='+', black='-') for the motor with an internal tap on 6.6 V (blue='+', black='-') for the receiver.
    Similar to this one only with slightly less capacity?
    I'm not aware of any charger that will handle the 6.6. V port separately. It is probably o.k. to charge this battery with any charger suitable for 9.2 V (8 cells) rechargeable NiCd batteries. Use the 9.2 V (red/black) wires for charging. A matching charger is e.g. this one. You will haev to build your own connector and/or adapter to match/mate to the connector on the battery.
  3. Lurch180


    Aug 16, 2017
    Thanks for quick reply, I will try to charge it through the red and black leads.
    Thanks Harald
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