Battery PCB - which one? (repair project)- Mtbr.com
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  1. #1
    db9
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    Battery PCB - which one? (repair project)

    Looking for assistance please,
    I have batteries from a old(er) Magicshine 808 (vintage unknown but at least 6 years old)
    While I have 'newer' batteries for riding (KD's) the one pictured is the original and still work reasonably well - recently the run time is about 45 min on high (using them around the yard at night while I work outside) then they will abruptly shut off - multimeter says I still have voltage in each S pack (3.88 to 3.9) so across the battery where soldered to the PCB 7.8v (or so)
    However measuring on the output (where the red/black wires are ) I get nothing. Looked for bad connections all looks ok and surface mount components look visibly ok .. (though there are no SMC's at RT1 & RT2)
    I would suspect then that there is a intermittent issue somewhere on the board..
    Of the PCB circuits available which one would be usable as a replacement?

    Thanks for reading & Merry Christmas
    Attached Thumbnails Attached Thumbnails Battery PCB - which one? (repair project)-photo%5B1%5D.jpg  


  2. #2
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    You can go for any suitable 2S PCB - either from Hunk Lee or tchwarehouse-au (ebay sellers) or any other seller that claims suitable current output that you need.

  3. #3
    Yeah!
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    I'd suggest checking for a hot battery before soldering up a new regulator. Six years is a long time for batteries rated for 500 recharge cycles. A battery pushing too much thermal to a protected regulator can also cause a shutdown.

    Also, check the batteries for charge balance. Sometimes a pack just needs a rebalance to get back to 80-90% of it's initial charge and will last several more years.
    I will suffer no butt-hurt fools!

  4. #4
    db9
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    Thank you ..

    Quote Originally Posted by Flamingtaco View Post
    Also, check the batteries for charge balance. Sometimes a pack just needs a rebalance to get back to 80-90% of it's initial charge and will last several more years.
    how would I check for balance charge? and then how would I rebalance?

    Thank you

  5. #5
    db9
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    Quote Originally Posted by MK96 View Post
    You can go for any suitable 2S PCB - either from Hunk Lee or tchwarehouse-au (ebay sellers) or any other seller that claims suitable current output that you need.
    Thank you,
    What (or how to find out) what the current output requirement of the 808 is?

  6. #6
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    Quote Originally Posted by db9 View Post
    Thank you,
    What (or how to find out) what the current output requirement of the 808 is?
    2A capacity is more than enough for any of the 808 series.
    GoPro adapters for bike lights http://www.pacifier.com/~kevinb/index.html

  7. #7
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    You'll need to split the cells or at least pairs and put them in the diagnostic charger like OPUS BT C3100 to see whether they are any good after 6y.

    Quote Originally Posted by db9 View Post
    Thank you ..



    how would I check for balance charge? and then how would I rebalance?

    Thank you

  8. #8
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    Or better yet, use hobby charger which can do all you need. You just need to properely connect cells to the hobby charger - to main leads and 2S balancing port. Search google for charging in series with hobby chargers.

    Anyway I assume you made short somewhere. You just need to put it on the charger for a second to reset the circuit. Then if circuit is not damaged you should get voltage on output as usual.

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