These tests below only note the estimated ratings for these batteries at the time I tested them. Any battery that is not a genuine Samsung, Sony, LG, Panasonic, or Sanyo can change at any time! This is one of the hazards of using “rewrapped” or batteries from other manufacturers so carefully research any battery you are considering using before purchasing.
Misusing or mishandling lithium-ion batteries can pose a SERIOUS RISK of personal injury or property damage. They are not meant to be used outside of a protected battery pack. Never exceed the battery’s current rating and keep the plastic wrap and top insulating ring in perfect condition.
Testing batteries at their limits is dangerous and should never, ever, be attempted by anyone who has not thoroughly studied the dangers involved, understands the risks, has the proper equipment, and takes all appropriate safety precautions.
If the battery has only one current rating number, or if it only says "max", then I have to assume the battery is rated at that current level for any type of discharge, including continuous.
Bottom Line
While this cell has an exaggerated current rating is it a good performer. It is identical in appearance and similar in performance to the Golisi S35 and Efest 35A 3700mAh 21700’s.
Both of these Listman cells had a bit over 4000mAh capacity. While this is a good thing it indicates that this cell might not be the exact same cell as used by Golisi and Efest.
Upon learning that this cell had an exaggerated rating, iJoy (the ones who donated the cells for testing) told me that they will instruct the factory to change the rating on the wrap from 40A to 30A. While I would definitely prefer that a cell was tested and rated accurately before being sold I am glad that iJoy is willing to change the exaggerated current rating.
There are earlier versions of this cell with a useless 60A “pulse” rating on the wrap. This was a ridiculous rating and I am glad it was removed.
I am estimating this cell’s ratings at 30A and 3800mAh minimum, though you might get more capacity from them than that.
Two cells were donated for the purposes of testing by iJoy (IJOY - The World Leading Vape Manufacturer-Avenger/Diamond/Captain/Capo/20700). Thank you!
Continuous Current Discharge Graph
Ratings Graphic
Performance Specs
DC Internal Resistance = 16.3mOhms (milliohms) average for the two cells.
Total energy delivered down to 3.2V at 10A continuous = 10.5Wh (Watt-hours) average
Total energy delivered down to 3.2V at 20A continuous = 8.2Wh (Watt-hours) average
Total energy delivered down to 3.2V at 30A continuous = 5.5Wh (Watt-hours) average
I want to work for the vaping community full time! If you feel what I do is worth a couple dollars a month and you would like early access to battery availability and testing news and a say in what I test then please consider becoming a patron and supporting my testing efforts: Battery Mooch is creating battery tests and educating vapers | Patreon
To see how other cells have tested check out this link: List of Battery Tests | E-Cigarette Forum
Misusing or mishandling lithium-ion batteries can pose a SERIOUS RISK of personal injury or property damage. They are not meant to be used outside of a protected battery pack. Never exceed the battery’s current rating and keep the plastic wrap and top insulating ring in perfect condition.
Testing batteries at their limits is dangerous and should never, ever, be attempted by anyone who has not thoroughly studied the dangers involved, understands the risks, has the proper equipment, and takes all appropriate safety precautions.
If the battery has only one current rating number, or if it only says "max", then I have to assume the battery is rated at that current level for any type of discharge, including continuous.
Bottom Line
While this cell has an exaggerated current rating is it a good performer. It is identical in appearance and similar in performance to the Golisi S35 and Efest 35A 3700mAh 21700’s.
Both of these Listman cells had a bit over 4000mAh capacity. While this is a good thing it indicates that this cell might not be the exact same cell as used by Golisi and Efest.
Upon learning that this cell had an exaggerated rating, iJoy (the ones who donated the cells for testing) told me that they will instruct the factory to change the rating on the wrap from 40A to 30A. While I would definitely prefer that a cell was tested and rated accurately before being sold I am glad that iJoy is willing to change the exaggerated current rating.
There are earlier versions of this cell with a useless 60A “pulse” rating on the wrap. This was a ridiculous rating and I am glad it was removed.
I am estimating this cell’s ratings at 30A and 3800mAh minimum, though you might get more capacity from them than that.
Two cells were donated for the purposes of testing by iJoy (IJOY - The World Leading Vape Manufacturer-Avenger/Diamond/Captain/Capo/20700). Thank you!
Continuous Current Discharge Graph
Ratings Graphic
Performance Specs
DC Internal Resistance = 16.3mOhms (milliohms) average for the two cells.
Total energy delivered down to 3.2V at 10A continuous = 10.5Wh (Watt-hours) average
Total energy delivered down to 3.2V at 20A continuous = 8.2Wh (Watt-hours) average
Total energy delivered down to 3.2V at 30A continuous = 5.5Wh (Watt-hours) average
I want to work for the vaping community full time! If you feel what I do is worth a couple dollars a month and you would like early access to battery availability and testing news and a say in what I test then please consider becoming a patron and supporting my testing efforts: Battery Mooch is creating battery tests and educating vapers | Patreon
To see how other cells have tested check out this link: List of Battery Tests | E-Cigarette Forum
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