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Thread: PCB for Battery Pack

  1. #1
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    Default PCB for Battery Pack

    Hello can anyone help me with the wiring for my pack!
    This is how I wired the battery pack with a PCB board...
    'B+', 'B-', and 'COM'. These correspond with the +, the - and the common node (the connection in the middle of the pack) and should be connected to these points.
    The P+ and P- on the board are the output of the battery pack, so I connect my light to these points, P+ is obviously the + side and P- is the negative side.

    I can't get it to fire am I doing something wrong , the voltage reads 7.54vlt


    Tony
    Last edited by trimixdiver; 08-18-2012 at 10:30 PM.

  2. #2
    Flashaholic* Klem's Avatar
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    Default Re: PCB for Battery Pack

    When you say you can't get it to fire, are you saying that the 7.54V is what you measure going into the PCB from the two batteries in series, and 0V is what you measure coming off the P+ and P-?

    7.54V is a 2 cell battery so you need 3 wires going into the PCB according to the wiring diagram that should come with the PCB. So there should be 5 wires in total attached to your PCB...3 going in and 2 coming off.

    Can you take a couple of photo's and show us.

  3. #3

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    is the pack charged? if not, the BCM may be working fine.

  4. #4
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    Default Re: PCB for Battery Pack

    Here is the PCB I used...





    And here is the battery pack wired...
    [IMG][/IMG]
    [IMG][/IMG]

    The volts are 7.54 from the connecter...
    Last edited by trimixdiver; 08-29-2012 at 12:03 AM.

  5. #5
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    Default Re: PCB for Battery Pack

    I had the same issue after building a pack. It had gone into protection mode and was sorted after connecting to a charger.

  6. #6
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    Default Re: PCB for Battery Pack

    So you may think it has to be charged?
    this is the charger I have coming...

    http://www.ebay.com.au/itm/220800935...84.m1439.l2649

    How can I connect to my battery ?
    Tony
    Last edited by trimixdiver; 08-19-2012 at 12:16 AM.

  7. #7
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    Default Re: PCB for Battery Pack

    Quote Originally Posted by trimixdiver View Post
    So you may think it has to be charged?
    this is the charger I have coming...

    http://www.ebay.com.au/itm/220800935...84.m1439.l2649

    How can I connect to my battery ?
    Tony

    It has to be connected to a charger. even if just for a second.

    I guess if you havent got a charger you could connect any voltage source with in acceptable range ( ie less than 8.4v but more than the voltage of your battery at current charge).

    But as I said...thats a guess and your problem may not be the same as what problem I had.

  8. #8
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    Default Re: PCB for Battery Pack

    You miss read my post , I like to know how can I connect to my battery connecters with this charger?
    I just became aware of the single plug.
    Last edited by trimixdiver; 08-19-2012 at 01:18 AM.

  9. #9
    Flashaholic* Klem's Avatar
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    Default Re: PCB for Battery Pack

    Cut the plug off the charger and fit one that matches the one on your battery.

    My money is on what the other guys are saying...it probably needs charging before it will register any voltage coming out of the PCB.

  10. #10

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    I've had similar issues where the PCM needed to be initialized by charging. I pulled lots of hair out figuring it out, though just had to charge the sucker and all was good.
    Regards,
    Damien Siviero
    http://damiensiviero.com

  11. #11
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    Default Re: PCB for Battery Pack

    Damien going through the same thing , but I have a bold head .
    Still waiting on my charger to arrive.

  12. #12
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    Default Re: PCB for Battery Pack

    After waiting 34 days Still have not received my charger from China apparently was lost somewhere .
    So looks like I'm in the market for a another charger...

    http://cgi.ebay.com/ws/eBayISAPI.dll...m=380457839188
    anyone know if I can use this one or have one in mind?

    Tony
    Last edited by trimixdiver; 08-24-2012 at 03:29 AM.

  13. #13

    Default Re: PCB for Battery Pack

    yes, that should be fine. It's a more complex charger though so you'll need to make sure you use the right settings.

    as mentionned in the description:
    Li-ion/Polymer cell count: 1-6cells => your pack is 2 cells (important for the charging voltage).
    Charge current range: 0.1-5.0A => depends on your battery pack. not sure what current is a good charging current your 2S4P pack.

    note that this charger doesn't include a power source. you'll need a quite powerfull ac-dc adaptor (11-18V output)

    perhaps somehting like this could work:
    http://www.ebay.com/itm/Tenergy-Gold...item5ae49dfce2
    http://www.ebay.com/itm/Tenergy-TLP-...item5ae46ce62a
    but I think he doesn't ship to Australia...

    Johan

  14. #14
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    Default Re: PCB for Battery Pack

    You should just buy a universal LiIon charger for your application. This will avoid confusion and future problems.
    http://tlslights.com/ your source for quality affordable dive lights, Mag-lite conversions and weapon lights. Now a Federal Firearms Dealer.

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    Default Re: PCB for Battery Pack

    Johan that's the same e-bay guy that lost my charger...
    No thanks.

  16. #16
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    Default Re: PCB for Battery Pack

    Hi Hector you got one of these for me?

  17. #17
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    Default Re: PCB for Battery Pack

    pm sent
    http://tlslights.com/ your source for quality affordable dive lights, Mag-lite conversions and weapon lights. Now a Federal Firearms Dealer.

  18. #18
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    Default Re: PCB for Battery Pack

    Hi guys ok so it has arrived, this is what I bought , looks cool.

    Just going through the setting I know how to set up, but how do I use the Balance setting keeps coming up as error ?
    Do I need to use Balance or just Charge?
    Tony
    Last edited by trimixdiver; 08-29-2012 at 12:43 AM.

  19. #19

    Default Re: PCB for Battery Pack

    Charging is just two leads

    Balancing requires a special connector + the Charging connector


    If your talking about charging the pack described above... do not use the balance option of your charger
    Last edited by Codiak; 08-29-2012 at 10:11 AM.

  20. #20
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    Default Re: PCB for Battery Pack

    The instruction says for best optimize use a connecter , also seen some vids they say the same.

  21. #21

    Default Re: PCB for Battery Pack

    reading instructions is always a good starting point.

    Understanding the reasons why is even better.

    The pack you have above doesn't have a balance connector wired.

  22. #22
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    Default Re: PCB for Battery Pack

    I know this I build the battery pack, what I was thinking is to add a wirefor this?

  23. #23

    Default Re: PCB for Battery Pack

    I'm a fan of balancing packs and there are two ways for you to go.
    1) wire a standard connector like a JST
    or
    2) use a balancing PCM

    Either is effective I prefer the latter.

  24. #24
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    Default Re: PCB for Battery Pack

    I already have a PCB on the pack ,so where can I connect wire to?
    Tony

  25. #25

    Default Re: PCB for Battery Pack

    I don't think you PCB has a balancing function so you need to get a balancing connector and wire according to specs

    good reference
    https://sites.google.com/site/tjingu...ce-connectors/

    basically, the connector will have 1 wire more then the number of cells in the pack and you solder one wire to each batter contact point.

    Google a bit if you need a diagram

  26. #26
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    Default Re: PCB for Battery Pack

    Do I really need this wire I mean what's the worse that could happen , kill the battery pack?
    Tony

  27. #27

    Default Re: PCB for Battery Pack

    Quote Originally Posted by trimixdiver View Post
    Do I really need this wire I mean what's the worse that could happen , kill the battery pack?
    Tony
    Balancing simply ensures that all the cells of the pack are equally charged.
    No it's not required and no the lack of it will not kill the pack. It may shorten the life of the pack, but it's not life threatening.

    Just "charge" you pack with the + and - leads and don't worry about balancing.

  28. #28
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    Default Re: PCB for Battery Pack

    Cool thanks for the heads up.

  29. #29
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    Default Re: PCB for Battery Pack

    Hi guys just doing a burn test using this pack , what is the procedure for burn time, do I just keep going to the light goes out...or turn of when the battery reaches a certin AMP ?
    I'm thinking the PCB will cut the light of...
    Don't want to damage the pack...
    Tony
    Last edited by trimixdiver; 08-30-2012 at 04:10 AM.

  30. #30
    Flashaholic* 350xfire's Avatar
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    Default Re: PCB for Battery Pack

    Make sure you do it while the light in is a bucket of water. Turn light on and wit until it dims.
    http://tlslights.com/ your source for quality affordable dive lights, Mag-lite conversions and weapon lights. Now a Federal Firearms Dealer.

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