Magicshine Bike Light Set MJ-8108- Mtbr.com
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  1. #1
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    Bonking ... not feelin' well Magicshine Bike Light Set MJ-8108

    Can I buy a circuit board for the batteries?

    Got the lights & battery well wet the other day. Total time in the pouring rain not just a shower was approx 1 hour. Not the first time they have been damp/wet in a ride home though. Each time I take them out of the nylon holder so they can dry but this time I forgot, but I don't think this is the reason for the failure. More to do with the insulation holding moisture.

    Hoping they will work but just in case I'm looking for a circuit board for the batteries.

    No water in light unit but the damp has got into the battery pack and sat there as the insulation used is still damp after 5 days.

    Batteries check out OK after desoldering from the circuit board. Corrosion can be seen on the positive tab but I can repair this. The small red wire you can see is the balance wire that is used to balance charge the batteries during charge.

    http://www.photobox.co.uk/slideshow?album_id=483267673

  2. #2
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    just been reading about Plastidip etc.

    should have thought as I race rc cars in the open and we enclose electronics in ballons etc

  3. #3
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    You can buy circuit boards (prolly slightly different but work the same) from batteryspace.com

    Ditch the Magicshine battery (2s/2p 4x18650) and buy yourself a pair of the IMR 26650's and build yourself a 2s/1p that's about 3/4 the size and slightly more capacity.

  4. #4
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    Quote Originally Posted by chelboed
    You can buy circuit boards (prolly slightly different but work the same) from batteryspace.com

    Ditch the Magicshine battery (2s/2p 4x18650) and buy yourself a pair of the IMR 26650's and build yourself a 2s/1p that's about 3/4 the size and slightly more capacity.
    chelboed, is this the battery you are referring too? A two series set-up would still be about 4000mAh vs the MagicShine 4 x 18650s at about the same. ( assuming the MS cells are 2000mAh ea. )

    I think if I was to run two triple XPG's in Parallel I might consider using a 4 x 26650 set-up to provide a little extra juice. The only problem would be ...how to charge. I think these cells require a different kind of charger(?) Definitely would mean more money for the initial set-up.

  5. #5
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    Yeah, Cat...that's the one.

    The thing I've noticed (with my own lights) is that the IMR has less resistance and handles the higher current really well. Not as much voltage sag there.

    I had a 4x 18650 pack that was 2200mAh and ran with my triple for 2hr 44min.

    I built this IMR pack (25% smaller physical size) and got 2hr 45min.

    Could be that it's a LiMnNi chemistry versus the LiIon chemistry. Another nice option is the LiPo flat cells.

  6. #6
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    Quote Originally Posted by chelboed
    Another nice option is the LiPo flat cells.
    I have these from my rc car hobby

    https://www.nexusracing.com/images/T...9e78ea58393437

    Can they or the MS batteries be connected to the head light without damaging it?

    They have the same nominal voltage as the MS batteries. Hard cased to boot and I have a charger suitable to charge them. Would need to make up the leads and make a waterproof case though

  7. #7
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    Irri Tant, as long as the pack voltage is 7.4v you'll be fine.

    Dx do sell the battery for you light on it's own http://www.dealextreme.com/details.dx/sku.32756

    But have you seen the battery on the latest MS? Looks like a cool upgrade and I'm sure it won't be long 'till they sell it on it's own http://www.dealextreme.com/details.dx/sku.44459

  8. #8
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    Quote Originally Posted by yetibetty
    Irri Tant, as long as the pack voltage is 7.4v you'll be fine.
    cheers

    Tried it today and all is fine. Will have to use model car battery charger to balanace charge the batteries

    Have seen those items in your links. The one with the LCD display is 40 here in the UK

    also this available if anyones looking
    http://cgi.ebay.co.uk/New-WATERPROOF...item3f030dbb84
    Last edited by Irri Tant; 09-17-2010 at 10:12 AM.

  9. #9
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    Quote Originally Posted by chelboed
    You can buy circuit boards (prolly slightly different but work the same) from batteryspace.com
    what about this?

    http://cgi.ebay.com/Protection-Circu...item335f518d08



    Quote Originally Posted by chelboed

    Ditch the Magicshine battery (2s/2p 4x18650) and buy yourself a pair of the IMR 26650's and build yourself a 2s/1p that's about 3/4 the size and slightly more capacity.
    just discharged MS kit batteries @ 1 amp (max the Orion will do) and they held 3547mah down to 6.4v for the pack

    http://www.photobox.co.uk/my/photo?a...2096#500832096
    Last edited by Irri Tant; 09-27-2010 at 05:13 AM.

  10. #10
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    Quote Originally Posted by Irri Tant
    arrived today but mine have arrived and they only have one chip, u3 is missing

    https://img3011.photobox.co.uk/38314...ca78179bf5.jpg
    Last edited by Irri Tant; 10-05-2010 at 05:46 AM.

  11. #11
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    U3 and the chip right above that are the series pass FETs that let the protection circuit turn the current flow to and from the battery on and off. Those 2 ICs are in parallel and only 1 of them is actually required for the board to work. They install 1 or both of the ICs based on the current rating they spec for the particular part number.

  12. #12
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    Quote Originally Posted by Irri Tant
    arrived today but mine have arrived and they only have one chip, u3 is missing

    https://img3011.photobox.co.uk/38314...ca78179bf5.jpg
    Good news. They are sending out the correct item FOC and I'll receive a full refund

  13. #13
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    Quote Originally Posted by Irri Tant
    Good news. They are sending out the correct item FOC and I'll receive a full refund
    arrived 19th Nov 2010

    this one works

    seller has updated listing to show correct item

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