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Thread: Charging two 2s in series at the same time?

  1. #1
    Join Date
    Feb 2014
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    ny
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    Default Charging two 2s in series at the same time?

    Does anyone know where to get a balance plug harness to charge up two 2s lipos at the same time?


    Thanks

  2. #2
    Join Date
    Jun 2015
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    Mt
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    You can get them right here at OSE. They are called balance boards. Any place that sells chargers and accessories should have them.
    Bob

  3. #3
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    Apr 2007
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    I've bought splitters before to do them in series so cells will still balance properly. I got them from HK but you could probably find them stateside.

    The thing with splitters and doing in series is you have to connect them right or POOF, some magic smoke will release. I'm careful about doing it when I do it but now, I don't bother anymore. I don't use 2S packs much or at all.

    A wrong connection can damage a charger as well.
    Nortavlag Bulc

  4. #4
    Join Date
    Feb 2008
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    The commercial ones are almost exclusively for charging in parallel not series.

    Charging in Series has the disadvantage that you have to plug the power wires and the balance wires in to the correct sockets, or things go very badly wrong instantly, probably breaking the charger, maybe melting ballance wires, and endangering the cell packs. On the plus side, unlike parallel charging you can series charge dissimilar cell counts, ie a 2s and a 4s to make a 6s, and assuming you do plug them into the correct port it is just the same as charging a single pack, while you should only charge packs with the same state of charge, nothing disasterous will happen if you accidentally plug a charged and a discharged pack together, as long (as it is on a balance charge), it will just take many hours to charge and ballance the packs.

    Charging in parallel reduces the risk of human error messing things up as it doesn't matter what sockets you plug into (as they are all effectively the same socket), but if you accidentally plug a charged and a discharged pack the charged one will try to charge the discharged one as soon as you connect them, and while the voltage will be OK the charge rate will be almost totally uncontrolled, (I say almost as there is only so much current little balance wires, balance board, and connectors can take), this shouldn't effect the charger as it is happening totally externally to it, but something is going to melt and endanger the packs.

    If you use any sort of multi pack charging setup you need to be extra careful, but I think that using a fused parallel balance board, and plugging in the main power leads several seconds before the balance plugs minimises the risk. That way you can't plug the wrong pack into the wrong port, if there is a huge imbalance in the packs it will blow the fuse and give you the opportunity to notice before plugging in the little wires that are in danger of melting, and if the imbalance isnt enough to blow the fuse instantly the charge current has the opportunity to reduce before plugging in the little wires.
    Paul "tug Killer" Upton-Taylor, Cat lover.
    FastElectricBoats.co.uk

  5. #5
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    There you have the proper answer^^^
    Nortavlag Bulc

  6. #6
    Join Date
    Jun 2015
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    I stand corrected.I didn't see the word series. Speaking before engaging brain.

  7. #7
    Join Date
    Feb 2014
    Location
    ny
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    Default

    Thanks everybody for taking time to reply. I ordered a balance board so I can charge in parallel. I also ordered some ec5 plugs to make a wire harness.
    Thank you so much for your help. Your knowledge is invaluable

    Jerry

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