To prevent any confusion with the eGo-type "batteries", I use the term "cell" here to refer to a single 18350, 18650, 26650, etc.
While the test results are hard data, the conclusions and recommendations I make based on these tests are only my personal opinion based on my criteria for setting a rating. Carefully research any cell 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.
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 continuously.
Bottom Line
This is a very poor performing cell with exaggerated current and capacity ratings. It has only 1/2 the capacity (684mAh) of the Samsung 25R5 (1350mAh) at 20A continuous down to 3.2V due to the large amount of voltage sag. When discharged continuously at its claimed 40A rating it almost instantly dropped to just above 3.0V and reached my 2.8V cutoff a few seconds later.
Its appearance doesn't match any Samsung/Sony/LG/Panasonic/Sanyo cell I have and appears to be of Chinese manufacture. It has the classic roughly done top crimp of many cells made in China. Both of the cells I tested had signs of improper storage (rust).
I am rating this Enook at 20A and 2400mAh but it sags badly. The 18650 ratings table has been updated to include this cell.
Continuous-Current Test Results
Pulse-Current Test Results
Comments
List of Battery Tests | E-Cigarette Forum
https://www.e-cigarette-forum.com/f...afety-grades-and-pulse-performance-data.7566/
https://www.e-cigarette-forum.com/f...des-picking-a-safe-battery-to-vape-with.7447/
https://www.e-cigarette-forum.com/f...fety-grades-and-pulse-performance-data.7554//
While the test results are hard data, the conclusions and recommendations I make based on these tests are only my personal opinion based on my criteria for setting a rating. Carefully research any cell 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.
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 continuously.
Bottom Line
This is a very poor performing cell with exaggerated current and capacity ratings. It has only 1/2 the capacity (684mAh) of the Samsung 25R5 (1350mAh) at 20A continuous down to 3.2V due to the large amount of voltage sag. When discharged continuously at its claimed 40A rating it almost instantly dropped to just above 3.0V and reached my 2.8V cutoff a few seconds later.
Its appearance doesn't match any Samsung/Sony/LG/Panasonic/Sanyo cell I have and appears to be of Chinese manufacture. It has the classic roughly done top crimp of many cells made in China. Both of the cells I tested had signs of improper storage (rust).
I am rating this Enook at 20A and 2400mAh but it sags badly. The 18650 ratings table has been updated to include this cell.
Continuous-Current Test Results
Pulse-Current Test Results
Comments
- At 10A continuous it reached 2181mAh. This is truly terrible performance for a 2600mAh cell at 10A so I am rating it at 2400mAh.
- At 20A continuous the temperature rose to 77°C. This is just below the average temperature of a cell operating at its continuous discharge rating (CDR) and is an indication that we are operating near its true rating.
- At 40A continuous, the cell's rating, the voltage instantly collapsed to just over 3.0V and quicly down to 2.8V. This is quite clearly not a 40A cell.
- I am setting a CDR of 20A for this cell but its performance is terrible above about 10A. While operating any cell near its rated maximum current level causes damage, I would expect ok cycle life at 20A continuous.
List of Battery Tests | E-Cigarette Forum
https://www.e-cigarette-forum.com/f...afety-grades-and-pulse-performance-data.7566/
https://www.e-cigarette-forum.com/f...des-picking-a-safe-battery-to-vape-with.7447/
https://www.e-cigarette-forum.com/f...fety-grades-and-pulse-performance-data.7554//
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