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Bench Test Results: Hohm Tech Sherlock Hohm 2 30.7A 3116mAh 20700...accurately rated but LiPo

Discussion in 'Batteries and Chargers' started by Mooch, Nov 23, 2019.

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  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.

    B54CA968-DC2B-4BD2-AB16-F14A6081DD96.jpeg 7FDF9DB4-E48D-49BF-ABDB-0F2BDE9B8E54.jpeg F6F96171-848F-4163-B399-C97395B14403.jpeg D6201633-5FBB-47A5-8AA1-9DF8C9BB3AD3.jpeg


    Bottom Line
    This is an accurately rated cell that performs essentially the same as the Sanyo NCR20700A and a touch better than the Molicel INR-20700A. I don’t know if you’d see the difference when using any of them though.

    This cell uses the same “chemistry” as LiPo cells. While this chemistry is not “dangerous” it does react more violently and at a higher temperature if the cell goes into thermal runaway from being badly abused or short-circuited. This Hohm Tech cell has passed the basic safety tests though.

    The capacities for the four Sherlock Hohm 2 cells I tested ranged from 3154mAh to 3195mAh at 620mA (0.2C) down to 2.5V. This is decent consistency. I am rating it the same as Hohm Tech did, 3116mAh.

    This cell has a 41.3A “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.

    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 118W/41.3A 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.

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

    DF6C9FF1-8C34-4DE1-8374-D27A4B6C066C.jpeg 1BF26884-E3B7-42BE-911D-6AF093AE857F.jpeg

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


    Continuous Current Discharge Graphs
    0C5E617A-9C53-475B-B494-8EF6A8296C8D.jpeg 8DC078D5-548D-4C80-8744-4D0984E2AC85.jpeg FFBCDFE7-BE82-44D2-A734-11AE6B41E72C.jpeg


    Ratings Graphic
    1B52BB88-7429-4900-9EC1-3412E8540797.jpeg


    Performance Specs
    • DC Internal Resistance = 14.3mOhms*** (milliohms) average for the three cells.
    • Watt-hours (energy) delivered at 10A down to 3.2V = 9.0Wh
    • Watt-hours (energy) delivered at 20A down to 3.2V = 7.7Wh
    • Watt-hours (energy) delivered at 30A down to 3.2V = 5.7Wh
    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 2
    • Like Like x 1
  2. sonicbomb

    sonicbomb Vaping Master Verified Member ECF Veteran

    Feb 17, 2015
    1187 Hundertwasser

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