The costs of running this huge site are paid for by ads. Please consider registering and becoming a Supporting Member for an ad-free experience. Thanks, ECF team.

Bench Test Results: Hohm Tech Hohm Grown “V2” 30.3A 4244mAh 26650, accurately rated decent performer

Discussion in 'Batteries and Chargers' started by Mooch, Dec 7, 2019.

Thread Status:
Not open for further replies.
Image has been removed.
URL has been removed.
Email address has been removed.
Media has been removed.
  1. Mooch

    Mooch Electron Wrangler Verified Member ECF Veteran

    Supporting member
    May 13, 2015
    These tests below only note the ESTIMATED ratings for these batteries at the time I tested them. Any battery that is not a genuine Samsung, Sony, Murata, LG, Panasonic, Molicel, or Sanyo can change at any time! This is one of the hazards of using “rewrapped” or batteries from other manufacturers so carefully research any battery you are considering using before purchasing.

    Misusing or mishandling lithium-ion batteries can pose a SERIOUS RISK of personal injury or property damage. They are not meant to be used outside of a physically and electrically protected battery pack. Never exceed the battery’s current rating and keep the plastic wrap and top insulating ring in perfect condition. Use of any of these batteries is AT YOUR OWN RISK.

    Testing batteries at their limits is dangerous and should never, ever, be attempted by anyone who has not thoroughly studied the dangers involved, understands the risks, has the proper equipment, and takes all appropriate safety precautions.

    If the battery has only one current rating number, or if it only says "max", then I have to assume the battery is rated at that current level for any type of discharge, including continuous.

    A20CDFF6-EBDC-4FE3-A63D-223A1C2578D3.jpeg 1BE47A93-7FB8-4249-AD1A-2C9B972ADF72.jpeg E11DDA34-288E-4037-B122-BF571E56749D.jpeg 5CE652FE-624A-466D-850B-FF8A66068FAA.jpeg


    Bottom Line
    This is a decent performing 26650 cell that is accurately rated. Like most 26650’s it has some cell-to-cell performance inconsistency but that’s not a big issue. There is a “V2” on the wrap that indicates it is a different cell from the original Hohm Grown.

    The capacities for the four Hohm Grown cells I tested ranged from 4367mAh to 4398mAh at 840mA (0.2C) down to 2.5V. This is good consistency and all of the cells easily exceed their capacity rating. I like to see cells test out at least 100mAh above their rating to ensure no cell, due to normal cell-to-cell inconsistencies, can be below the rating. I am rating this cell at the same capacity as Hohm Tech, 4244mAh.

    The four cells had DC internal resistances (DC IR) ranging from 14.8mOhms to 17.1mOhms. This is a wider range than I like to see but typical for 26650’s. The cell with the 17.1 mOhm DC IR performed a bit worse than the others.

    The four cells reached 76°C-79°C when discharged at 30A. This is just below Hohm Tech’s 80°C max temperature rating so I am giving these cells a 30A rating. I prefer a cell to run at a few degrees below the max rated temperature at their rated current level though, to ensure that normal cell-to-cell differences never cause a cell to go over the rated temperature.

    This cell has a 41.1A “max” rating in larger print on the wrap, which I am very much against. Hohm Tech is in the process of switching over to a wattage-based ratings system though and will not be making their “max” ratings the biggest numbers on the wrap. This should be happening over the next couple of months for all their cells and I welcome the removal of these large print “max” numbers.

    B2249F3F-1D85-4FFF-B23E-765B5D0A5BEA.jpeg 5AF527C4-2F3B-4DA2-8386-CDD93336E26D.jpeg

    The new wattage-based ratings system, when fully implemented, could make things easier for new vapers to choose the Hohm Tech cell that best fits the way they vape. But it means they might not learn about current ratings and other things they will need to know if they use any other company’s batteries. I’m torn as to whether it is a good idea or not. I look forward to seeing how the community reacts to it.

    The “max” ratings are temperature limited to 80°C. This means you could potentially use this cell at up to its 120W/41.1A rating if you don’t let it get hot. While it is possible to go that high with this cell it does not lead to good performance and your vaping time will be short. I recommend limiting use of any cell to its continuous current/power rating or lower. This reduces risk, increases overall cell life, and improves performance.

    For this cell I recommend staying under 20A-25A (60W-75W) as there is a huge drop in the watt-hours of energy delivered (which determines your vaping time) at 30A.

    Some of the ratings on the wrap are printed quite small over a patterned background. This makes them hard to read, reducing their usefulness to vapers.

    Hohm Tech (www.hohmtech.com) donated cells for testing, thank you!


    Continuous Current Discharge Graphs
    5A38BEB4-F591-49FA-9E31-B6A9E34BDB4D.jpeg 54E76B6A-3E25-455A-941D-F6BBF9D05504.jpeg


    Ratings Graphic
    C88266AF-518A-41D8-B454-17F7B5C9B3B1.jpeg


    Performance Specs
    • DC Internal Resistance = 15.6mOhms*** (milliohms) average for the four cells.
    • Watt-hours (energy) delivered at 10A down to 3.2V = 13.3Wh
    • Watt-hours (energy) delivered at 20A down to 3.2V = 10.4Wh
    • Watt-hours (energy) delivered at 30A down to 3.2V = 6.1Wh
    I want to work for the vaping community full time! If you feel what I do is worth a couple dollars a month and you would like early access to battery availability, battery and charger testing and news, and a say in what I test, then please consider becoming a patron and supporting my testing efforts: Battery Mooch is creating battery tests and educating vapers | Patreon.

    To see how other cells have tested check out this link: List of Battery Tests | E-Cigarette Forum

    ***I have switched test jigs, resulting in slightly lower IR readings versus my previous setup. Add 1.6mOhms to this IR value in order to compare these cells to others tested previously.
     
    • Informative Informative x 4
    • Like Like x 1
    • Winner Winner x 1
  2. sonicbomb

    sonicbomb Vaping Master Verified Member ECF Veteran

    Feb 17, 2015
    1187 Hundertwasser
    Some good numbers for this one
     
    • Agree Agree x 1
Thread Status:
Not open for further replies.

Share This Page

  1. This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
    By continuing to use this site, you are consenting to our use of cookies.
    Dismiss Notice