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Bench Test Results: Hohm Tech Hohm Run 39.1A 3023mAh 21700...slightly overrated but decent performer

Discussion in 'Batteries and Chargers' started by Mooch, Dec 4, 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.

    A2F88FE0-5495-4923-8A58-CFD367878701.jpeg 6E69CDB0-AE13-4705-BDBF-3C25E758BAF1.jpeg 05F7CBE5-3644-445D-B26C-EDFE07933719.jpeg C49DD7FE-0DB9-4E2A-A099-6797BE74F738.jpeg


    Bottom Line
    This is a decent performing 21700 cell that has a slightly exaggerated current rating. It performs a bit better than the Sanyo NCR20700A but not as good as the Molicel P42A, Samsung 40T, or Samsung 30T 21700’s.

    The capacities for the four Hohm Run (not Hohm Run XL) cells I tested ranged from 3054mAh to 3133mAh at 600mA (0.2C) down to 2.5V. This isn’t great consistency but is typical of cells not from the major manufacturers. I am rating it the same as Hohm Tech did, 3023mAh.

    It runs a bit too hot in my testing at its claimed rating of 39.1A, about 85°C-86°C, to be rated that high as that goes over Hohm Tech’s 80°C limit. I have always measured cell temperatures a bit higher than what Hohm Tech measures and we have discussed this at length. I stand by my measurements though and every test is done the same way so direct comparisons can still made between the different cells I test.

    I am rating these cells at 35A continuous with a temperature limited rating of 45A (Hohm Tech’s temp-limited rating is 49.5A). This means you could run this cell at 45A as long as you do not let it get hotter than 80°C. But I recommend not going that high as it increases your risks, reduces performance, and speeds up the aging of the cell.

    This cell has Hohm Tech’s new wattage-based ratings. It is rated at 112W continuous and has a 142W temperature-limited “max” rating. As long as you don’t let the cell reach 80°C Hohm Tech says you can run it at 142W. They do say this reduces the life of the cell though and I agree. To reduce risk, extend overall cell life, and increase performance I recommend not going over about 35A or 100W. All cells are stressed when you run them near or above their ratings so this is not a recommendation just for the Hohm Run cell.

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

    4C764E46-C8B5-4934-8170-B6D6A536455B.jpeg 40B8B0EB-567D-4719-8616-C9681674167A.jpeg

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


    Continuous Current Discharge Graphs
    D0AE053A-FAE1-4D63-A1A4-FEB31BFC14BA.jpeg F312F1CA-10F3-4CC0-8A69-3C28E0518434.jpeg 80C2D107-895D-45F3-A196-8737FD04BD98.jpeg


    Ratings Graphic
    5152911E-49E1-4484-A6FE-BD3820BF274E.jpeg


    Performance Specs
    • DC Internal Resistance = 12.7mOhms*** (milliohms) average for the four cells.
    • Watt-hours (energy) delivered at 10A down to 3.2V = 8.7Wh
    • Watt-hours (energy) delivered at 20A down to 3.2V = 7.7Wh
    • Watt-hours (energy) delivered at 30A down to 3.2V = 6.0Wh
    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.
     
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