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Description: This is an incredibly simple one cell 18650 Battery Holder. When someone thinks of 18650 Cells they tend to think of flashlights first, which is fair since that is what they have been primarily used for. However, with this battery holder you will gain the ability to incorporate 18650 cells into applications like robotics or prototyping by simply dropping one into this device and attaching the leads, that’s it.

Every 18650 Battery Holder is equipped with two 6" cables for power and ground, each protruding from opposite ends of the casing. Both have been terminated with bare wire leads.


  • Holder: 74.5mm x 21.5mm x 17.7mm (2.93" x 0.84" x 0.69")
  • Overall Length: 379.3mm (14.9")


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Customer Comments

  • Two questions:

    (a) does anyone (or Sparkfun staff) know what gauge the wire leads are?

    (b) it looks like the Sparkfun 18650 batteries are the kind with the flat end for positive. Does this holder have enough room for a button-top 18650 battery as well?

    I expect to order some of these and the dual-battery ones. If I don’t see these answers by the time I get them in hand, I’ll post my observations.

    • I just got a few of these and in answer to your questions a) the wire is ~22 AWG, b) the Sparkfun 18650’s are flat top and those fit snugly in these holders, button top on the other hand “fit” as in they will go in and make a connection, but they are not a nice fit and requires a screwdriver and fair bit of coercion to get them out so unfortunately I would file it under NOT recommended. I was really hoping that button top would fit nicely too (since I have a half dozen of those already) but no dice. Hope this helps.

      PS. The same is true for wire gauge and fitting of button top batteries in the dual holders, since I got a few of those too

    • I have the same concern about batteries fitting in this holder, because I bought some protected Gray/Black Ultrafire button top 18650’s on ebay and battery holders and they are way too tight. If you look at this picture, Sparkfun’s non-protected Li 18650 that doesn’t have a protruding button top smashes the spring nearly all of the way down. So I was just going to buy one of these holders to find out, but just doing this simple analysis proves to me at least that they will be too small for the protected batteries I have. YMMV though, my friend has some Red Ultrafire button top 18650’s that DO fit in the same holders I bought (which look exactly like these 95 cents on ebay). From memory, the wires are 22 awg stranded or smaller.

    • I also had these two same questions in my mind right away when i saw the product

  • Does anybody know what type of plastic this was made from? I tried to super-glue it to an ABS plastic case which did not work. Almost none of the glue stuck to the battery holder.

  • I bought some of these, and also the 2-cell ones, and not a chance will they fit my Nitecor 18650’s; I think the problem is that these are protected cells which makes them a bit longer - pity.

    I’m also having the same problem with my Nitecor 14400’s - these are supposedly AA size, but no, they are also a bit longer than standard AA’s, so I can’t use off-the-shelf AA battery holders.

    I bought Nitecor’s because they are good quality - there is so must junk out there - especially in Li-Ion !

    This begs the question: Who out there it making good quality battery holders which will accommodate the extra length of protected Li-Ions such as 14400’s and 18650’s ? I’ve searched Amazon, (that’s MPD - Memory Protection Devices), DigiKey, ebay etc, but I think they all sell just the standard stuff which won’t fit. I think I’m going to have to make these up myself.

    Just a general comment about battery holders - most tend to be poor quality plastic, with sharp ears that tend to scour and tear any plastic sleeving commonly found on the more expensive rechargeables, and often with totally inadequate wiring ie far too thin.

    So, sigh, I have my lovely Nitecor’s, but no holders !!

  • Sweet, I’ve been waiting for this. Sweet price tag, too. Thanks, and please don’t ever run out :) When I think of 18650, I think of splitting open useless laptop packs and harvesting those cells which are still moderately useful. They’re almost always this size.

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