Battery pack with 18650 cells

Discussion in 'Power Electronics' started by Kristian83, Nov 11, 2017.

  1. Kristian83

    Thread Starter New Member

    Nov 11, 2017
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    Hi
    I'm making a batterypack with 18650 cells. The voltage i need is 11,1 v (12v).
    I was hoping that someone with more knolledge than me could take a look att my configuration and tell me if its right.
    I have eight 18650 cells 2000 mAh. What capacity will this configuration give me?

    batteripack_Kristian83.png

    Thank you
    /Kristian, swe
     
  2. dl324

    AAC Fanatic!

    Mar 30, 2015
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    Welcome to AAC!

    4000mAh. Two of the batteries in the group of 4 are extraneous.
     
  3. Dodgydave

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    Jun 22, 2012
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    4Ah @ 11.1V..
     
  4. ian field

    AAC Fanatic!

    Oct 27, 2012
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    I'd invest in a good fire extinguisher if I were you.....................
     
  5. dendad

    Active Member

    Feb 20, 2016
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    I would say to not have uneven groupings of batteries. If you have 2 in parallel, do not then change to 4!
    All groups need to be the same or Ian Field's comment it likely to be correct.
     
  6. ian field

    AAC Fanatic!

    Oct 27, 2012
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    Probably not that dangerous if the TS adds a charge balancer board, but 2P combinations stacked in series with 4P stages; will discharge sooner and the current flow pushed by the other cells will try to reverse charge them. That can't be good!
     
  7. BobTPH

    Active Member

    Jun 5, 2013
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    How do you intend to charge them?

    Bob
     
  8. Alec_t

    AAC Fanatic!

    Sep 17, 2013
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    How do you intend to avoid over-charging or over-discharging individual cells?
     
  9. ian field

    AAC Fanatic!

    Oct 27, 2012
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    Has the TS wandered off?
     
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