Imren Green 40A 3200mAh 18650 Bench Test Results...just 17A, the purple Imren 3000mAh rewrapped!

Discussion in 'Batteries and Chargers' started by Mooch, Feb 9, 2016.

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  1. Mooch

    Mooch Electron Wrangler Verified Member ECF Veteran

    Supporting member
    May 13, 2015
    Tested at 10A-40A constant current and 30A-50A pulsed. These cells were donated 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 cells 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.jpeg image.jpeg image.jpeg image.jpeg


    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 batteries at the rating listed on the wrap and pointing out when they fail to meet that listed rating.


    Bottom Line
    In my opinion this is just a 17A 3000mAh battery with wildly exaggerated ratings. At 15A down to 3.2V it delivers about 5% less capacity than the LG HG2. It also runs hotter than the HG2. Its appearance and performance are essentially identical to the Imren Purple 40A 3000mAh battery I tested earlier. I believe that this is just a rewrap of the Imren 3000mAh battery.


    Continuous-Current Test Results
    image.png


    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.png image.png


    Shootout with the Imren Purple 40A 3000mAh cell
    Their performance is essentially identical except near the end of the discharge where the damage the purple Imren suffered during the 30A and 35A discharges shows up as a loss in capacity.
    image.png


    Comments
    • At 10A it reached 2850mAh. This is average to good performance for a 3000mAh-rated cell. I am rating this cell at 3000mAh.
    • Its temperature at 15A was 73°C, a few degrees below the average for a cell operating at its CDR.
    • At 20A the temperature rose to 90°C. This is several degrees above the upper limit of a battery operating at its CDR.
    • At 25A the temperature rose to 106°C. This is a ridiculously high temperature for a battery operating at its CDR and is above my 100°C safety limit.
    • Discharges at 30A and 35A were not done due the already dangerously high temperature at 25A.
    • A discharge was done at 40A, the battery's rating. The voltage quickly collapsed below 3.2V making this cell essentially useless. This is clearly not a 40A cell.
    • I am setting a CDR of 17A for this cell since at this current its operating temperature is at the average for a cell operating at its CDR. While operating any cell near its rated maximum current causes damage to the cell, I would expect decent cycle life from this cell at 17A.
    • I have included pulsed discharges but I haven't set pass/fail standards for pulse testing yet. The discharges were done at 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.

    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

    18350 Safety Grades and Pulse Performance Data | E-Cigarette Forum

    18650 Safety Grades -- Picking a Safe Battery to Vape With | E-Cigarette Forum

    26650 Safety Grades and Pulse Performance Data | E-Cigarette Forum
     
    MikeyConti, Izan, sonicbomb and 3 others like this.
  2. sonicbomb

    sonicbomb Vaping Master Verified Member ECF Veteran

    Feb 17, 2015
    1187 Hunterwasser
    Good work, thank you.
     
    Mooch likes this.
  3. XXFa113nXX

    XXFa113nXX Senior Member Verified Member ECF Veteran

    Jul 25, 2014
    United States
    Wow...amazes me that a company would put out something that's only 17A rated and say its 40A. And some wonder why batteries explode. This is irresponsible to say the least
     
  4. Mooch

    Mooch Electron Wrangler Verified Member ECF Veteran

    Supporting member
    May 13, 2015
    It's a perfect match for their 30A 3500mAh battery that is really only a 10A battery. :)
     
    XXFa113nXX and KenD like this.
  5. KenD

    KenD Vaping Master ECF Veteran

    Aug 20, 2013
    Stockholm, Sweden
    But "everyone else does it so it's ok", right? :)

    Sent from my M7_PLUS using Tapatalk
     
    Mooch likes this.
  6. XXFa113nXX

    XXFa113nXX Senior Member Verified Member ECF Veteran

    Jul 25, 2014
    United States
    I'm surprised they don't have a lawsuit against them yet
     
  7. Chuck64

    Chuck64 Super Member ECF Veteran

    Nov 17, 2015
    NV. USA
    I was unable to find your test of the purple 40A 3000 mah.
     
  8. Mooch

    Mooch Electron Wrangler Verified Member ECF Veteran

    Supporting member
    May 13, 2015
  9. Chuck64

    Chuck64 Super Member ECF Veteran

    Nov 17, 2015
    NV. USA
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