This cell was purchased by me and used only for testing. To prevent any confusion with the eGo-type "batteries", I use the term "cell" here to refer to a single 18650, 26650, etc.
These are safety-oriented tests, not for performance. Though you can get a lot of performance information from them they are primarily done to check the manufacturer's/rewrapper's ratings
and to establish safe continuous discharge limits.
Disclaimer
The 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.
Bottom Line
In my opinion, when compared to its ratings, this is a terrible performing battery. This is a 10A+ continuous discharge current (CDR) cell with very low capacity for its rating. I recommend not using it above 15A as it gets badly damaged at 20A. When attempting a 4 second pulse at its 64A rating, the voltage instantly plunged to my 2.5V cutoff.
Constant-Current Test Results
Pulsed-Current Test Results
These pulsed-current tests are only done to show the performance of the cell at its pulse or maximum discharge rating.
Comments
https://www.e-cigarette-forum.com/forum/blog-entry/list-of-battery-tests.7436/
https://www.e-cigarette-forum.com/f...des-picking-a-safe-battery-to-vape-with.7447/
These are safety-oriented tests, not for performance. Though you can get a lot of performance information from them they are primarily done to check the manufacturer's/rewrapper's ratings
and to establish safe continuous discharge limits.
Disclaimer
The 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.
Bottom Line
In my opinion, when compared to its ratings, this is a terrible performing battery. This is a 10A+ continuous discharge current (CDR) cell with very low capacity for its rating. I recommend not using it above 15A as it gets badly damaged at 20A. When attempting a 4 second pulse at its 64A rating, the voltage instantly plunged to my 2.5V cutoff.
Constant-Current Test Results
Pulsed-Current Test Results
These pulsed-current tests are only done to show the performance of the cell at its pulse or maximum discharge rating.
Comments
- The constant-current graph has two temperature plots on it using the CBA's own temperature sensor. The sensor reads over 20°C too low and these tests were done for an upcoming blog entry. I thought the temperature plots could be deleted the same way the current plots can be...I was wrong. My apologies for the confusing graph.
- The cell is clearly marked as being rated at 32A continuous and 64A pulsed.
- At 10A the cell reached about 2575mAh. This is pretty bad performance for a 3500mAh-rated cell at 10A. I am giving this cell a capacity rating of 2900mAh.
- At 15A the maximum temperature reached 66°C. This should be too low a temperature to set 15A as the CDR but, as shown later, damage is already starting at this current level in my opinion.
- At 20A the maximum temperature reached 72°C. This should be too low for a cell operating at its CDR. The voltage drop is severe though, quickly going below 3.2V. This indicates that the cell is operating at beyond its rating.
- At 25A the temperature only rose to 79°C. The voltage quickly dropped to about 2.85V though. This is clearly not a 32A cell.
- A discharge at 32A was done. The voltage instantly plunged the down to the 2.80V cutoff.
- Two more cycles at 20A clearly showed signs of damage to the cell. I did not continue with the two additional cycles at the CDR, five total, that I usually do. The damage was already pretty severe. This isn't even a 20A cell and in my opinion some damage would still occur at 15A.
- I am setting a CDR of 10A+ for this cell. While operating any cell near its rated maximum current causes damage to the cell, I would hope for good cycle life from this cell at 10A+. Its performance was so bad though I can't say for sure.
https://www.e-cigarette-forum.com/forum/blog-entry/list-of-battery-tests.7436/
https://www.e-cigarette-forum.com/f...des-picking-a-safe-battery-to-vape-with.7447/
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