Samsung 30Q 20A 3000mAh 18650 Bench Retest Results...a great 15A/3000mAh battery!

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Mooch

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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.

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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 3000mAh battery that Samsung rates at 15A.

Continuous-Current Test Results
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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.
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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 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
 
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Mooch

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Not really under rated, Samsung rates their batteries accurately.

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.
 
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