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Thread: 21700 Vs 26650 Batteries

  1. #1
    Flashaholic*
    Join Date
    Nov 2002
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    Rosemount
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    Default 21700 Vs 26650 Batteries

    I have been considering a new, single cell, flashlight that uses something a bit bigger than the 18650. I have been "on the fence" between 21700 and 26650 batteries. Are most of the currently available 21700 and 26650 pretty similar in their capacity?

    For example, the Klarus 21GT-50 lists 5000 mAh. The Klarus 26650 also lists 5000 mAh.

    The Nitecore NL2650DW is 5000 mAh. The Nitecore NL2150 is 5000 mAh.

    Considering that some typical 21700 batteries are at 5000 mAh and some typical 26650 batteries are, too, is it pretty much "a horse apiece" going with either a 21700 light or a 26650 light?

  2. #2
    Flashaholic*
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    Mar 2006
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    Anaheim, CA.
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    Default Re: 21700 Vs 26650 Batteries

    I am going with 21700 lights as the 26650 lights are too bulky.

  3. #3
    *Flashaholic* HKJ's Avatar
    Join Date
    Mar 2008
    Location
    Copenhagen, Denmark
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    9,512

    Default Re: 21700 Vs 26650 Batteries

    26650 batteries are old technology, generally they are not updated to the latest. The 21700 is the hot size that get all the latest chemistries, it do also have smaller volume than 26650.
    My website with battery, charger, usb reviews, comparisons & information: https://lygte-info.dk/
    Latest addition is multimeter reviews

  4. #4
    Unenlightened
    Join Date
    Dec 2019
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    6

    Default Re: 21700 Vs 26650 Batteries

    I would go with 21700 - the flashlight will be less bulky and this battery format will become far more prevalent in the coming years. This is the battery format that Tesla has moved to (they call it 21-70), so I suspect that we will eventually see many of these cells on the market in future and the 21700 should ultimately be cheaper than the 26650 for the same capacity.

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