Tested at 10A-22A constant current and 20A-40A pulsed. These cells were donated for the purposes of testing by Brad Meyers (FB juice Junkies group admin). 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.
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 only a 10A 5200mAh battery with exaggerated ratings. Though rated at 60A pulse, just 40A pulses drops it to 2.52V. It is identical in appearance to the Keeppower 20A 5200mAh and Vappower 20A 5200mAh, also 10A batteries. I do not recommend running it at above 10A/35W due to the huge voltage sag at higher current/power levels.
Continuous-Current Test Results
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.
Insert Insert
Comments
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
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.
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 only a 10A 5200mAh battery with exaggerated ratings. Though rated at 60A pulse, just 40A pulses drops it to 2.52V. It is identical in appearance to the Keeppower 20A 5200mAh and Vappower 20A 5200mAh, also 10A batteries. I do not recommend running it at above 10A/35W due to the huge voltage sag at higher current/power levels.
Continuous-Current Test Results
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.
Insert Insert
Comments
- At 10A it reached a bit over 4900mAh. This is terrible performance for a 5500mAh-rated cell operating at 10A. I am rating this cell at 5200mAh.
- Its temperature at 15A was 88°C, way above the average for a cell operating at its CDR. The capacity has already dropped significantly at this current level, indicating that it is being operated at above its rating.
- At 20A the temperature rose to 80°C. This is lower than the temperature for the 15A discharge because the run time was so short. Almost immediately the voltage dropped to a very low level.
- At 22A, the cell's rating, the cell is essentially useless.
- I am setting a CDR of 10A for this cell since this current level is about as high as you can go before the temperature rises too high and the voltage drops too low. While operating any cell near its rated maximum current causes damage, I would expect decent cycle life from this cell at 10A.
- The cells never reached dangerous temperatures. At higher discharge current levels the voltage collapsed and significantly shortened the discharge time. This limited the temperature increase.
- 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
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