PCB question from existing battery pack- Mtbr.com
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  1. #1
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    PCB question from existing battery pack

    I have one of the old geomangear magicshine replacement batteries; that I finally opened up. Appears to have decent panasonic cells for the time circa 2011. There are two extra white wires on the PCB. Any thoughts as to what they are? Some balancing leads?

    Thanks!


    Heres a pic for reference

    PCB question from existing battery pack-imageuploadedbytapatalk1442410533.006718.jpg

    PCB question from existing battery pack-imageuploadedbytapatalk1442410555.254221.jpg

  2. #2
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    Quote Originally Posted by ljracer View Post
    I have one of the old geomangear magicshine replacement batteries; that I finally opened up. Appears to have decent panasonic cells for the time circa 2011. There are two extra white wires on the PCB. Any thoughts as to what they are? Some balancing leads?

    Thanks!


    Heres a pic for reference

    Click image for larger version. 

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    Click image for larger version. 

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    Looks like those two wires go to a thermal sensor glued on the side of one of the cells. Typically that's an added safety feature to keep tabs on the battery temperature during charging and throttle back the charging current if things get too hot.

  3. #3
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    Yep, yes, and, definately those are the leads for the thermal resistor. Do not disengage until the bomb is armed.
    I will suffer no butt-hurt fools!

  4. #4
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    Quote Originally Posted by bigflamingtaco View Post
    Yep, yes, and, definately those are the leads for the thermal resistor. Do not disengage until the bomb is armed.
    +1 ^^^

  5. #5
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    PCB question from existing battery pack

    Thanks for the responses! Any special order of disassembly? Im going to pull the cells out and replace.

    Thanks

  6. #6
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    Quote Originally Posted by ljracer View Post
    ...Some balancing leads?
    If I were rebuilding that pack, I'd add a balancing connector and charge with a hobby charger. I don't know about how heavily used that pack was, but it might still be going today if it had been occasionally balance charged.
    GoPro adapters for bike lights http://www.pacifier.com/~kevinb/index.html

  7. #7
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    Good idea. Pack still works. Only with shorter run times.
    I'll do some searching on adding balance leads and which is a decent inexpensive hobby charger.

  8. #8
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    I use my son's. I think it is a Turnigy 6 something. Works well, good price, easy to use. Have to get an old laptop power supply to power it. Pretty cheap at Goodwill or you can get a power supply for it from Hobbyking
    GoPro adapters for bike lights http://www.pacifier.com/~kevinb/index.html

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