Discussion in 'Battery Testing Conversation' started by Mooch, Sep 19, 2015.
Allow me to update Mooch's year old battery test thread
Mooch's Test Results: Enook 35amp, 3600mah. Here is Mooch's write up.
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" 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.
This Enook is preposterously overrated. At 35A, this cell's rating, it ran for less than one second before plunging to 3.2V. Enook did the same kind of overrating with their 40A 3200mAh cell. These two are among the most overrated cells I have ever seen.
This Enook's appearance is identical to the 10A 3300mAh Panasonic NCR18650GA but it has a lower capacity than the Panasonic and performs a bit worse. It could be a lower grade NCR18650GA.
I am rating this Enook at 10A and 3200mAh. Its maximum vaping amps (MVA) rating is 15A, limited by extreme voltage sag. The 18650 ratings table has been updated to include this cell.
Continuous-Current Test Results
Comparison to the Panasonic NCR18650GA
Pulse-Current Test Results
No pulse tests were done as this is a NCR18650GA
There is no 18650 that can have a factory/manufacturer rating over 30A.
There is no 3000mAh 18650 that can have a rating over 20A.
There is no 3100mAh-3600mAh 18650 that can have a rating over 10A.
There is no 18650 with a capacity rating over 3600mAh.
At 10A continuous this cell delivered about 2850mAh. This is truly terrible performance for a high internal resistance 3600mAh cell at 10A so I am rating it at 3200mAh.
At 35A, the cell's rating, it delivered only 2mAh down to 3.2V. Clearly, this is not a 35A cell.
I am setting a CDR of 10A for this cell. While operating any cell near its rated maximum current level causes damage, I would expect ok cycle life at 10A continuous.