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Thread: Charger for 18650 LiFEPo4?

  1. #1
    Flashaholic
    Join Date
    Oct 2006
    Location
    Winnipeg
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    150

    Default Charger for 18650 LiFEPo4?

    I am big into the safe chemistry and was thinking of getting this battery

    http://www.dealextreme.com/details.dx/sku.1879

    Unfortunately, I can't seem to find a charger that would charge this. The LiFePO4 needs max charging voltage of 3.6 volts, much less than the 4.2 volts of the standard Li-ions.

    If anyone has bought these, what kind of charger are you using?

    Dennis

  2. #2

  3. #3
    Flashaholic
    Join Date
    Oct 2006
    Location
    Winnipeg
    Posts
    150

    Default Re: Charger for 18650 LiFEPo4?

    Thanks Norm. Those chargers look pretty fancy to me and cost too much for me.

    I am looking more in the price range and design of the WF-138 http://www.dealextreme.com/details.dx/sku.1236 .

    Alternatively, since I already have the WF-138 (charges CR123A LiFePo4 and regular Li-ions), I guess I could modify it to fit a 18650. Now if I could find a 18650 battery holder.

    Dennis

  4. #4

    Default Re: Charger for 18650 LiFEPo4?

    Quote Originally Posted by LiteShow View Post
    Thanks Norm. Those chargers look pretty fancy to me and cost too much for me.

    I am looking more in the price range and design of the WF-138 http://www.dealextreme.com/details.dx/sku.1236 .

    Alternatively, since I already have the WF-138 (charges CR123A LiFePo4 and regular Li-ions), I guess I could modify it to fit a 18650. Now if I could find a 18650 battery holder.
    Perhaps this system will work:

    http://www.candlepowerforums.com/vb/...ad.php?t=89363

    Since the WF doesn't have banana jacks, I suggest you cut a piece of roughly 10-15 mm diameter wooden dowel (or a rectangular bar of wood hacked out of a bigger piece with a saw) to length = 34 mm - 2 x (height of brass screw heads + washer, if used) - nominal thickness of wire, if clamped under screw or washer, and screw the wires onto either end to make an adapter to plug into the charger. This crude module should fit into the charger in place of a 16340 cell and pick up the circuit for the leads mounted on the clamp. Hope that makes sense.

    You can solder the wires to the screws as shown on the clamp, but I'd be inclined to just clamp them under the screw heads and maybe a washer. Soldering to the *washers* might be the easiest for installation. Be sure to use less than 15 mm long screws! Also, be REAL careful to get the polarity correct every time.

    I have no idea if it is safe to charge a larger battery with the wf-138, so get a second opinion before you do this! I think I read on an AW thread that it is CC/CV so the CC phase seems harmless enough, not sure what will happen at CV. I don't trust cheap Li batteries or their chargers, so I charge mine in a big, thick ceramic flowerpot, on the assumption that it can contain the fire if things don't turn out according to plan.

    I am fairly sure that at the low current of that charger, "monster wire" is going to be a big waste of copper. Use whatever you have that's substantially thicker than your hair.
    Last edited by Buck; 06-03-2008 at 12:44 AM.

  5. #5

    Default anything new?

    Is there anything new on the market for charging 18650 LiFePO4 cells? I'm probably going to get some of those cells for my A10 but can't find a charger that doesn't require a web of wiring.
    My Lights - Throw: Tiablo A10 R2; Balanced: Dereelight DBS 3SD-Q5 OP; WoF: Epsilon ED-P72, Tiablo ACE; AA: UltraFire WF-606A; Specialty: Ultrafire WF-502B P60 host + {Red, UV, IR}

  6. #6

    Default Re: anything new?

    This has a switch from 4.2v to 3.6v: http://www.kaidomain.com/ProductDeta...ProductId=6651
    Last edited by john2551; 02-16-2009 at 12:02 PM.
    Primary duty lights: (metal) Elektrolumens Pentalux 4C; (polymer) Pelican M8 LED; (hybrid) StreamLight 3C-XP
    Searchlight: AE PowerLight PL14
    Back-up mini lights: Nuwai TM301X-5, X-3, X-1
    Special LED signaling lights: Torfino ICE light, Inova 24/7, Adventurelights VIP

    NYPD flag, adopted in 1919

  7. #7

    Default Re: anything new?

    Quote Originally Posted by john2551 View Post
    This has a switch from 4.2v to 3.6v: http://www.kaidomain.com/ProductDeta...ProductId=6651
    Thanks!
    My Lights - Throw: Tiablo A10 R2; Balanced: Dereelight DBS 3SD-Q5 OP; WoF: Epsilon ED-P72, Tiablo ACE; AA: UltraFire WF-606A; Specialty: Ultrafire WF-502B P60 host + {Red, UV, IR}

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