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  1. #1
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    Light & Motion Lion battery mod

    Hi guys,

    Building converting a battery for a friend but running in to problems. The light setup he has is http://www.bikelights.com/Products/solo_logic.htm with a nicad battery 7.2 L&M sells a 11.4 lion.

    What I did was order a lion 11.4v from all-battery.com, opened the nicad pack and replaced it with the lion (which fits like a glove btw)

    So it works sometimes but when its fully charged it wont even turn on.

    My friend's theory is the PCB protection on the board, when I first plug it in spikes to 12,8v which the pcb thinks is a short so it shuts the battery off.

    I know the battery works though I use it to power other lights and is fine. But the solo logic is finky

    Anyway for me to get this to work, or trick the PCB?

    Thanks!

  2. #2
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    Reputation: bcane98's Avatar
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    Are you saying you swapped a 7.2V NiCad battery with a 11.4 LiOn battery?
    Ride till I can't stand anymore...
    Ghost 5500...

  3. #3
    Not dead yet, just playin
    Reputation: ohpossum's Avatar
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    I don't have one personally, but I'm pretty sure the L&M Solo lights have controllers that can take variable input voltage. So in Chowpay's case he can "swap" a 7.2V battery for something higher and expect it to work. Most Halogen lights are not like this.

    Chowpay, are you sure its an 11.4V battery?

    op
    www.msmtb.org - Mississippi Mountain Biking

  4. #4
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    It Works!!

    Alrighty so actually there was no problem you can easily swap the 11.1v Li-ion in place of the crappy 7.2 nicad.

    The reason it didnt work was because the adapter I made to use a tamyia charger wasnt making contact well with the leads on the pack. just so everyone knows for 45 bucks you can have a 120 dollar battery as long as you keep your dead nicad shell to place the battery in. This is the battery to switch with http://www.all-battery.com/index.asp...OD&ProdID=1147

    Works good!

  5. #5
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    Quote Originally Posted by chowpay
    Alrighty so actually there was no problem you can easily swap the 11.1v Li-ion in place of the crappy 7.2 nicad.

    The reason it didnt work was because the adapter I made to use a tamyia charger wasnt making contact well with the leads on the pack. just so everyone knows for 45 bucks you can have a 120 dollar battery as long as you keep your dead nicad shell to place the battery in. This is the battery to switch with http://www.all-battery.com/index.asp...OD&ProdID=1147

    Works good!
    What kind of charger are you using to recharge it? Do those type of cells require a balancer?
    Ride till I can't stand anymore...
    Ghost 5500...

  6. #6
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    Reputation: Walt Dizzy's Avatar
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    Charger?

    Quote Originally Posted by chowpay
    Hi guys,

    Building converting a battery for a friend but running in to problems. The light setup he has is http://www.bikelights.com/Products/solo_logic.htm with a nicad battery 7.2 L&M sells a 11.4 lion.

    What I did was order a lion 11.4v from all-battery.com, opened the nicad pack and replaced it with the lion (which fits like a glove btw)

    So it works sometimes but when its fully charged it wont even turn on.

    My friend's theory is the PCB protection on the board, when I first plug it in spikes to 12,8v which the pcb thinks is a short so it shuts the battery off.

    I know the battery works though I use it to power other lights and is fine. But the solo logic is finky

    Anyway for me to get this to work, or trick the PCB?

    Thanks!
    This is not safe unless you are using protected cells (or a protection PCB for the pack) and a Li-ion charger. Lithium cells can explode if they are overcharged. Do yourself a favor and stick with NiMH cells unless you are willing to learn do the job right.

    Check this link:
    http://www.rcgroups.com/forums/showthread.php?t=719116

    These guys have documented over 100 cases of exploding ("vent with flame") lithium ion batteries. They are a wonderful product if treated with respect. But if you don't know what you are doing, you can burn your house down. How's would you feel if your hack set off a fireball in your friend's living room?

    Walt

  7. #7
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    Walt, its a protected pack (click the link on the battery) .. i'm not an idiot haha.

    I did do it right btw. that pack is an 11.1v pack with protection circuit installed didnt modify the pcb at all. I thought that was the problem but it was much simpler than that , the connections were just not touching. now they are touching and everything works kosher.


    So now the light kicks ass for a mere 45 bucks.

    And here is the charger : http://www.all-battery.com/index.asp...ROD&ProdID=478

    I'll try to get some pics but basically what I did was make an adapter from the 3 prong L&M to connect to the tamiya connector on the charger. That was the hardest part. But what you can do is cut the connector off of the original Nicad charger and crimp a tamiya and use that instead. I just didnt have one to do that on so I had to make my own.

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