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Bench Test Results: Hohm Tech Hohm Stretch 22.1A 2944mAh 18650...accurately rated

Discussion in 'Batteries and Chargers' started by Mooch, Nov 19, 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.

    5621D9F0-64BA-4D33-B418-1E0D0295CD84.jpeg 978964D3-3D4A-43D4-8E5F-1A738D08A3E2.jpeg B3F7111C-B22A-4549-A22D-6C2548E2C872.jpeg 60439647-DE41-4549-AE75-43B09CECB74C.jpeg


    Bottom Line
    This is an accurately rated cell that performs essentially the same as the Hohm Tech Hohm Life, LG HG2, and the Samsung 30Q. The Sony/Murata VTC6 performed a touch better in my testing than all these cells but I don’t know if you’d see the difference when vaping.

    The capacities for the three Hohm Stretch cells I tested ranged from 3024mAh to 3039mAh at 589mA (0.2C) down to 2.5V. This is great consistency and is essentially the same capacity range as the Hohm Life, VTC6, HG2, and 30Q. I am rating it the same as Hohm Tech is though to prevent confusion, 2944mAh.

    Hohm Tech is switching over to a wattage-based ratings system and the Hohm Stretch cell is now using a wrap with these ratings. There is a 64W rating in a larger font (thankfully) and an “91W MAX” rating with an asterisk that is explained in fine print elsewhere on the wrap.

    This “max” rating is temperature limited to 80°C. This means you could potentially use this cell at up to its 91W rating if you don’t let it get hot. That is about 30A though and 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 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 and the Wh rating is hard to read on the patterned background they use.

    E8AB9634-18DC-4E81-A0D1-F56585F9FAE6.jpeg 2849A81A-5616-4031-BD7B-A66EF7A2957E.jpeg

    This 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.

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


    Continuous Current Discharge Graphs
    79286B9F-7FF9-4E12-A734-04E1D1EB5ECA.jpeg 7A4B85F8-E2EA-4C58-84A7-67F7C6A5D877.jpeg 44E56ED4-A2A5-4BD7-94C0-9A8AE921E232.jpeg


    Ratings Graphic
    A2F72725-15D9-4047-8464-932EFF44534D.jpeg


    Performance Specs
    • DC Internal Resistance = 16.8mOhms*** (milliohms) average for the three cells.
    • Watt-hours (energy) delivered at 10A down to 3.2V = 7.0Wh
    • Watt-hours (energy) delivered at 20A down to 3.2V = 5.8Wh
    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 3
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