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. You are responsible for your safety.
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 cell has only one rating on the wrap, "Max continuous discharge = 30A" with a larger "30A" above that. I am delighted to say that the rating is accurate. It is also good to see that Efest took off the useless pulse rating that they originally had on an earlier version of the wrap.
I don't know if they'll carry this change in the way they rate their cells over to their 18650's. I will be retesting all of the Efest 18650's in a few weeks. We'll see what happens.
This Efest appears to be the same cell as the iJoy and Ampking 20700's. It uses a plastic top ring insulator though versus the paper insulator on the iJoy and Ampking. This might make a difference to those who often get e-liquid on the battery.
Three of the four Efest's I tested didn't perform quite as well as the iJoy/Ampking cells though. The Efest's ran at a slightly lower voltage and with less capacity. The fourth Efest ran at a slightly lower voltage for a while but had the same capacity as the iJoy and Ampking.
I don't know if the Efests were a slightly lower grade or if there are batch to batch differences for a particular grade of this cell. The differences in performance between these Efests and the iJoy/Ampking are minor though and I don't think they will be noticeable in actual use.
This cell says "IMR 20700" on the wrap but I do not know if it actually uses the same lithium-manganese chemistry used by batteries from the big manufacturers with the IMR model number prefix.
I am rating this Efest at 30A and 3000mAh.
The four cells that were tested were donated by Efest (www.efestpower.com). Thank you!
Continuous-Current Test Results
Pulse-Current Test Results
Comparison to iJoy and Ampking 20700's
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. You are responsible for your safety.
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 cell has only one rating on the wrap, "Max continuous discharge = 30A" with a larger "30A" above that. I am delighted to say that the rating is accurate. It is also good to see that Efest took off the useless pulse rating that they originally had on an earlier version of the wrap.
I don't know if they'll carry this change in the way they rate their cells over to their 18650's. I will be retesting all of the Efest 18650's in a few weeks. We'll see what happens.
This Efest appears to be the same cell as the iJoy and Ampking 20700's. It uses a plastic top ring insulator though versus the paper insulator on the iJoy and Ampking. This might make a difference to those who often get e-liquid on the battery.
Three of the four Efest's I tested didn't perform quite as well as the iJoy/Ampking cells though. The Efest's ran at a slightly lower voltage and with less capacity. The fourth Efest ran at a slightly lower voltage for a while but had the same capacity as the iJoy and Ampking.
I don't know if the Efests were a slightly lower grade or if there are batch to batch differences for a particular grade of this cell. The differences in performance between these Efests and the iJoy/Ampking are minor though and I don't think they will be noticeable in actual use.
This cell says "IMR 20700" on the wrap but I do not know if it actually uses the same lithium-manganese chemistry used by batteries from the big manufacturers with the IMR model number prefix.
I am rating this Efest at 30A and 3000mAh.
The four cells that were tested were donated by Efest (www.efestpower.com). Thank you!
Continuous-Current Test Results
Pulse-Current Test Results
Comparison to iJoy and Ampking 20700's
Comments
- At 10A continuous this cell delivered 2797mAh. This is average performance for a 3000mAh rated cell at 10A so I am rating it at 3000mAh.
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