To prevent any confusion with the eGo-type "batteries", I use the term "cell" here to refer to a single 18350, 18650, 20700/21700, 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.
Bottom Line
This is an accurately rated 20700 cell (20mm diameter x 70mm length) that performs well but not quite as well as the Sanyo NCR20700A. Its appearance is similar to a Panasonic cell, with its 5-leg top contact, but I cannot confirm that this is indeed a Panasonic cell. It appears to be the same cell used by the iJoy 20700.
This Ampking uses a paper top ring insulator that should not be exposed to juice or otherwise it could swell and soften, possibly increasing the risk of the insulator being damaged when put into or removed from a device or charger.
I am rating this Ampking at 30A and 3000mAh.
My thanks to Ampking for donating the two cells for testing (www.ampking.com)!
I don't know when it will be available, or from which vendors, but I will post updates as I find out.
Continuous-Current Test Results
Pulse-Current Test Results and Comparison to the Sanyo NCR20700A
Comments
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.
Bottom Line
This is an accurately rated 20700 cell (20mm diameter x 70mm length) that performs well but not quite as well as the Sanyo NCR20700A. Its appearance is similar to a Panasonic cell, with its 5-leg top contact, but I cannot confirm that this is indeed a Panasonic cell. It appears to be the same cell used by the iJoy 20700.
This Ampking uses a paper top ring insulator that should not be exposed to juice or otherwise it could swell and soften, possibly increasing the risk of the insulator being damaged when put into or removed from a device or charger.
I am rating this Ampking at 30A and 3000mAh.
My thanks to Ampking for donating the two cells for testing (www.ampking.com)!
I don't know when it will be available, or from which vendors, but I will post updates as I find out.
Continuous-Current Test Results
Pulse-Current Test Results and Comparison to the Sanyo NCR20700A
Comments
- At 10A continuous this cell delivered about 2865mAh. This typical for a high-performance 3000mAh cell so I am rating it at 3000mAh.
- Its temperature of 80°C at 30A continuous is just above the average for cells being operated at their rating so I am rating this cell at 30A.
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