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Samsung 30Q 20A 3000mAh 18650 Bench Retest Results...a great 20A/3000mAh battery!

Discussion in 'Batteries and Chargers' started by Mooch, Jan 31, 2016.

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  1. Mooch

    Mooch Electron Wrangler Verified Member ECF Veteran

    Supporting member
    May 13, 2015
    Tested at 10A-25A constant current and 30A-50A 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 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.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 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 a great performing 20A 3000mAh battery. While Samsung rates it at 15A, it essentially equals the performance of the 20A HG2 and operates at the same temperature. I have no hesitations in rating the 30Q at 20A.


    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


    Comments
    • At 10A it reached 2700mAh. This is average to low performance for a 3000mAh-rated cell.
    • Its temperature at 15A was 71°C, a few degrees below the average for a cell operating at its CDR.
    • At 20A the temperature rose to 83°C. This is at the upper limit of a battery operating at its CDR but is equal to the LG HG2.
    • At 25A the temperature rose to 96°C. This is way too high a temperature for a battery operating at its CDR.
    • I am setting a CDR of 20A for this cell since its operating temperature is within the limits for a cell operating at its CDR and equal to the HG2. 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 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

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

    26650 Safety Grades and Pulse Performance Data | E-Cigarette Forum
     
    • Like Like x 15
  2. sonicbomb

    sonicbomb Vaping Master Verified Member ECF Veteran

    Feb 17, 2015
    1187 Hunterwasser
    So Samsung under rated it? Wow, Efest and their like take note.
     
    • Like Like x 5
  3. Topwater Elvis

    Topwater Elvis Vaping Master ECF Veteran

    Dec 26, 2012
    Texas
    Not really under rated, Samsung rates their batteries accurately.
     
  4. Mooch

    Mooch Electron Wrangler Verified Member ECF Veteran

    Supporting member
    May 13, 2015
    And LG accurately rates theirs. And yet, even with the same operating temperatures and performance, the 30Q and HG2 have different ratings. It gets complex quick!

    Each battery is rated differently and accurately by the company that rates them. But in my testing there are batteries that I feel, using my common test standards across all the batteries, that are underrated or overrated compared to the ratings given to them by the company that makes or sells them.
     
    • Like Like x 3
  5. defdock

    defdock Ultra Member ECF Veteran

    Nov 15, 2011
    Dark Forest
    Good info to know, as I just recently ordered one of these to replace an old istick30 cell.

    Glad to know at full operating specs, I won't be stressing the battery at all :)
     
  6. greasegizzard

    greasegizzard Vaping Master Verified Member ECF Veteran

    Dec 29, 2015
    Arkansas
    I'm kinda new around here and just wanted to say thanks, @Mooch . Very helpful stuff you're putting out, and I know it must be very time consuming.
     
    • Like Like x 3
  7. WharfRat1976

    WharfRat1976 Vaping Master Verified Member ECF Veteran

    May 31, 2014
    Austin, Texas
    Thanks Mooch.
     
    • Like Like x 1
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