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Thread: Does the 26650 size fit a C cell mag diameter wise?

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    Default Does the 26650 size fit a C cell mag diameter wise?

    Here is the cell: http://www.batteryspace.com/index.as...OD&ProdID=4796

    25500 is the exact size of a C cell but are not LiFePO4 safe chemistry: http://www.dealextreme.com/details.dx/sku.5035

    I'm not worried about the extra length only the diameter. Would 26mm be too wide? It states DO NOT remove paper insulator!
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    Flashaholic* Flash_Gordon's Avatar
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    Post Re: Does the 26650 size fit a C cell mag diameter wise?

    Those cells are 27.1mm with the cardboard sleeve. That is 1mm larger than a standard alkaline C cell. I think they will fit in a Mag.

    Drop some C cells in your Mag and eyeball to see if you have the room. Or take some duct tape and wrap a C cell up to 27mm and do a positive test.

    Mark

  3. #3

    Default Re: Does the 26650 size fit a C cell mag diameter wise?

    I just measured the I.D. of the C-cell Mag and it is exactly 26mm.

    That 25500 cell would fit perfectly if that picture of the digital caliper is precise.
    Last edited by RunningDave; 02-17-2009 at 10:51 PM.

  4. #4

    Default Re: Does the 26650 size fit a C cell mag diameter wise?

    Flash,

    I've decided to get the IMR26500 C cells from AW: http://www.cpfmarketplace.com/mp/sho...d.php?t=184887

    The length is 50mm & width 26mm, which is the normal C size. These LiFePO4 are 65mm long which are an odd length for me.
    Last edited by john2551; 02-18-2009 at 06:03 AM.
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    Lightbulb Re: Does the 26650 size fit a C cell mag diameter wise?

    Quote Originally Posted by john2551 View Post
    Here is the cell: http://www.batteryspace.com/index.as...OD&ProdID=4796

    25500 is the exact size of a C cell but are not LiFePO4 safe chemistry: http://www.dealextreme.com/details.dx/sku.5035

    I'm not worried about the extra length only the diameter. Would 26mm be too wide? It states DO NOT remove paper insulator!
    I purchased some 3200mAh 3.2V 26650 LiFePO4 cells from K2 Energy:

    http://store.peakbattery.com/lfp26.html

    K2 claims these are 26.2mm dia but the ones I received had cardboard sleeves at 26.7mm and will not fit my C Mag unless I remove the sleeve.

    F.Y.I. I noticed a power tool battery rebuilding service selling GD brand 3000mAh 3.7V 26650 Manganese dioxide (IMR) based Lithium batteries:

    http://www.voltmanbatteries.com/serv...ES-A123/Detail

    They claim to be 26.4mm dia.
    Last edited by nicknich22931; 03-28-2009 at 11:37 AM. Reason: mistake
    Nick Nichols, Covesville, VA, USA 22931
    bored and cut C M*G 26650 battery tubes http://www.candlepowerforums.com/vb/...d.php?t=232420

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    Flashaholic Turbo Guy's Avatar
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    Default Re: Does the 26650 size fit a C cell mag diameter wise?

    I use 26650 LiFePO4 cells in two MagLights. I removed the cardboard sleeves and applied heatshrink on the cells. They fit fine in my 5C light . Note I only use two of these cells to power a TLE-6EX drop in. You will need 4" (160 mm) heatshrink. Heatshrink will shrink a bunch so 4-1/2 or 180-200 mm will work. A a hair dryer will work to shrink it.

    My heat shrinked cells 1.033-1.038" dia. A123System cells with cardboard sleeves 1.060 and they are to big.
    Last edited by Turbo Guy; 03-28-2009 at 12:21 PM.
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    Flashaholic* eebowler's Avatar
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    Default Re: Does the 26650 size fit a C cell mag diameter wise?

    Can anyone tell me if the new 4sevens 26650 cells fit in a C size maglite without modification? Thanks.
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    Lightbulb Re: Does the 26650 size fit a C cell mag diameter wise?

    Quote Originally Posted by eebowler View Post
    Can anyone tell me if the new 4sevens 26650 cells fit in a C size maglite without modification? Thanks.
    I asked 4sevens the following question:

    "Also, Can you give me the specs as to length and width of the 26650 cells you sell? Since they have a protection circuit they may be too wide and long to fit my lights. As far as I know, you are the only one selling protected 26650 cells."

    their answer:

    "The 26650 is 1.044" D X 2.75" L"

    Note: 1.044" = 26.52mm, 2.75" = ​69.85mm
    Last edited by nicknich22931; 06-03-2012 at 06:58 AM. Reason: more info
    Nick Nichols, Covesville, VA, USA 22931
    bored and cut C M*G 26650 battery tubes http://www.candlepowerforums.com/vb/...d.php?t=232420

  9. #9
    Flashaholic* eebowler's Avatar
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    Default Re: Does the 26650 size fit a C cell mag diameter wise?

    Thank you nicknich!
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    Default Re: Does the 26650 size fit a C cell mag diameter wise?

    Anyone who tried 26650 in a Mag C yet? I now use it with 3xCR123 in a tube. The tube is exactly 26mm and suits with a very small margin.
    Last edited by Swedpat; 07-23-2012 at 03:26 AM.

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    Flashaholic* fivemega's Avatar
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    Default Re: Does the 26650 size fit a C cell mag diameter wise?

    I have never seen any 26xxx fit in unbored M*g "C" but all 25xxx will fit in diameter.

  12. #12

    Default Re: Does the 26650 size fit a C cell mag diameter wise?

    How about 2x 18650 on a 2c maglite?
    Do I need to go with a 3c for 2 18650s?
    How about 2 x 26650 EFEST Red in a 2c maglite?
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    Flashaholic* fivemega's Avatar
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    Default Re: Does the 26650 size fit a C cell mag diameter wise?

    Quote Originally Posted by Mr. Nobody View Post
    How about 2x 18650 on a 2c maglite?
    Do I need to go with a 3c for 2 18650s?
    How about 2 x 26650 EFEST Red in a 2c maglite?
    If you are using 2 bare (unprotected) 18650 cells, some modification will be needed but to fit 2 protected 18650 cells in 2C M*g, these or these are vise choice.
    All 26xxx cells are too fat to fit inside 2C M*g unless M*g barrel is bored out.
    To fit pair of 26650 cells, 3C M*g must be bored out. In this case some extra length can be filled with short dummy or extracted spring or shortening body.

  14. #14
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    Default Re: Does the 26650 size fit a C cell mag diameter wise?

    Quote Originally Posted by fivemega View Post
    All 26xxx cells are too fat to fit inside 2C M*g unless M*g barrel is bored out.
    Not true. A 26650 will sometimes fit in a C cell Mag. Odds are considerably better if the Mag in question is an old one (no 'C' in serial number) and the cell is unprotected. In particular, King Kongs and A123 Systems cells seem to fit well. I have even fit A123 Systems cells in some newer Mags.

  15. #15
    Flashaholic* fivemega's Avatar
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    Default Re: Does the 26650 size fit a C cell mag diameter wise?

    Quote Originally Posted by StorminMatt View Post
    A 26650 will sometimes fit in a C cell Mag. Odds are considerably better if the Mag in question is an old one (no 'C' in serial number) and the cell is unprotected.
    You are right. Stone aged M*g "C" and "D" barrels are slightly larger in diameter to accommodate some cells.

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