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HohmLife 36.3A 3077mAh 18650 Bench Test Results...only a 20A- battery but a great one, equal to HG2

Discussion in 'Batteries and Chargers' started by Mooch, Dec 1, 2015.

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  1. Mooch

    Mooch Electron Wrangler Verified Member ECF Veteran

    Supporting member
    May 13, 2015
    Tested at 10A-35A constant current and 30A-60A pulsed. These cells were purchased by me for the purposes of testing thanks to the wonderful donations from so many of you. Thank you! To prevent any confusion with the eGo-type "batteries", I use the term "cell" here to refer to a single 18650, 26650, etc.


    Disclaimer
    The statements, conclusions, and recommendations I make based on these tests are only my personal opinion. Carefully research any battery you are considering using before purchasing.

    Testing batteries at their limits is dangerous and should never, ever, be attempted by anyone who has not thoroughly studied the dangers involved and how to minimize them. My safety precautions are the ones I have elected to take and you should not assume they will protect you if you attempt to do any testing. Do the research and create your own testing methods and safety precautions.

    image.jpg image.jpg image.jpg image.jpg

    A note regarding current ratings and my testing
    If the cell has only one current rating number on it, or if it says "max discharging current" then I have to assume that the company is stating that the cell can be discharged at that current level in any way, including continuous. Otherwise they would have listed the current rating with two numbers as other companies have done. Or they would have labeled the rating on the wrap as "pulse" or "burst". Battery buyers should not have to hunt down what the number on the wrap means. I will be testing cells at the rating listed on the wrap and pointing out when they fail to meet that listed rating.


    Bottom Line
    In my opinion, though it is confusingly labeled it is a great almost-20A high capacity continuous discharge rating (CDR) battery. It is essentially equal to the LG HG2, just running a bit hotter. I have not tested the safety improvements that Hohm Tech says have been made to this battery compared to the HG2.


    Continuous-Current Test Results
    image.jpg


    Pulsed-Current Test Results
    These tests are done to show the performance of the cell at higher pulsed current levels. If you are running your mod at these levels be aware that you risk overheating, and possibly venting, the battery if there is a malfunction or accidental pressing of your mechanical mod's button.
    image.jpg image.jpg


    HohmLife vs HG2 graphs
    image.jpg image.jpg image.jpg


    Comments
    • This cell has a 36.3A rating without any indication on the cell or packaging as to whether that is a continuous or pulse rating. Since many people assume that this means the rating can be used for continuous discharges I have tested these cells at up to 35A continuous.
    • Doing some searching one can find out that the 36.3A rating is a "pulse" rating and that the CDR is 20.7A. But vapers shouldn't have to search to find the ratings for their cells. In my opinion, if there is a rating on the cell it should be the continuous rating. If the pulse rating is also displayed then the pulse length and rest times should be posted online, if not on the cell.
    • Without knowing the pulse length/rest times for the 36.3A pulse rating for this cell, and what criteria they used to establish the rating (voltage drop? temperature? other?), the pulse rating can't be used for comparing this cell to any other.
    • At 10A it reached about 2725mAh. This is a bit below the expected average performance for a 3077mAh-rated cell at 10A. I am giving this cell a 3000mAh capacity rating.
    • At 15A the maximum temperature reached 77°C. This is just below the average temperature of a cell operating at its continuous discharge rating (CDR).
    • At 20A the maximum temperature reached 85°C. This is a bit above the 82°C maximum acceptable temperature for a cell operating at its continuous discharge rating (CDR). This prevents me from giving it a solid 20A rating.
    • At 25A the temperature rose to 101°C. This is way too high for a cell operating at its CDR and is just above my 100°C safety limit.
    • At 30A the temperature rose to 105°C. This is way too high for a cell operating at its CDR.
    • A discharge at 35A showed increasing voltage sag and loss of capacity. The temperature rose to 118°C, way above my 100°C safety limit. This is clearly not a 36.3A cell.
    • Another two 20A discharges showed that no damage was done to the cell during the previous higher current discharges. This cell shows great high temperature tolerance.
    • I am setting a CDR of just under 20A for this cell. While operating any cell near its rated maximum current causes damage to the cell, I would expect decent cycle life from this cell at 20A.
    • I have included pulsed discharges but I haven't set pass/fail standards for pulse testing yet. The discharges were done at 30A-70A, 5sec on/30sec off, down to 2.5V. One chart shows the entire discharge at each level. The other chart is zoomed in to show the first 5 minutes to make it easier to see the voltage sag at different current levels.
    • This cell had good pulsed current performance and can be pulsed at up to 50A without the voltage being uselessly low.


    To see how other cells have tested and how hard you can safely push them, check out these links:
    List of Battery Tests | E-Cigarette Forum
    18650 Safety Grades -- Picking a Safe Battery to Vape With | E-Cigarette Forum
     
    • Like Like x 6
  2. T4KT1KZ

    T4KT1KZ Full Member

    Dec 22, 2014
    Abbotsford BC Canada
    You are an asset to the entire vaping community. Thanks for all your hard work.

    We need a battery with a "Mooch Certified CDR" ..
     
    • Like Like x 3
  3. sonicbomb

    sonicbomb Vaping Master Verified Member ECF Veteran

    Feb 17, 2015
    1187 Hunterwasser
    A 20 amp battery it may be, but it's still mislabeled
     
    • Like Like x 1
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