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 21700 cell has slightly exaggerated current rating it performs better than the Sanyo NCR20700A and is a great choice for mech/unregulated mods. Even for regulated mods at high current levels, over 25A, it’s a great choice if the Samsung 40T or its rewraps aren’t available. The Samsung 30T performs a lot better though.
I welcome the efforts of any company that wants to change over to rating their cells more accurately as Blackcell seems to be doing now. Their recently released 22A 2523mAh Electron 18650 is accurately rated. While the current rating is exaggerated with this 21700 it is a huge jump in accuracy over their preposterously rated 40A and 50A 3100mAh 18650’s that they used to sell. Hopefully Blackcell updates the wrap for this cell soon.
I know accurate ratings terrify the marketing departments for these companies, because they’re lower, but I feel strongly that accurate ratings will result in better sales over the long term. We want honesty, we want greater safety, and we will buy from the companies that offer this.
I am estimating this Blackcell’s current rating at 30A-35A depending on its cycle life requirements and how hot Blackcell allows the cell to run. Its estimated capacity is 3000mAh.
Three cells were donated for the purposes of testing by Blackcell (BLACKCELL). Thank you!
Continuous Current Discharge Graphs
Ratings Graphic
Performance Specs
- DC Internal Resistance = 14.8mOhms (milliohms) average for the two cells.
- Total energy delivered down to 3.2V at 10A continuous = 9.6Wh (Watt-hours) average
- Total energy delivered down to 3.2V at 20A continuous = 9.1Wh (Watt-hours) average
- Total energy delivered down to 3.2V at 20A continuous = 7.6Wh (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.
Blackcell paid a fee to be moved to the front of the testing queue, which currently has a 10-12 week backlog. This cannot influence my test results as they pay in advance, have no say about what is in this report, and I don’t care if any company never does this or donates batteries again. My reputation is a lot more important than any battery donation or payment.
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 21700 cell has slightly exaggerated current rating it performs better than the Sanyo NCR20700A and is a great choice for mech/unregulated mods. Even for regulated mods at high current levels, over 25A, it’s a great choice if the Samsung 40T or its rewraps aren’t available. The Samsung 30T performs a lot better though.
I welcome the efforts of any company that wants to change over to rating their cells more accurately as Blackcell seems to be doing now. Their recently released 22A 2523mAh Electron 18650 is accurately rated. While the current rating is exaggerated with this 21700 it is a huge jump in accuracy over their preposterously rated 40A and 50A 3100mAh 18650’s that they used to sell. Hopefully Blackcell updates the wrap for this cell soon.
I know accurate ratings terrify the marketing departments for these companies, because they’re lower, but I feel strongly that accurate ratings will result in better sales over the long term. We want honesty, we want greater safety, and we will buy from the companies that offer this.
I am estimating this Blackcell’s current rating at 30A-35A depending on its cycle life requirements and how hot Blackcell allows the cell to run. Its estimated capacity is 3000mAh.
Three cells were donated for the purposes of testing by Blackcell (BLACKCELL). Thank you!
Continuous Current Discharge Graphs
Ratings Graphic
Performance Specs
- DC Internal Resistance = 14.8mOhms (milliohms) average for the two cells.
- Total energy delivered down to 3.2V at 10A continuous = 9.6Wh (Watt-hours) average
- Total energy delivered down to 3.2V at 20A continuous = 9.1Wh (Watt-hours) average
- Total energy delivered down to 3.2V at 20A continuous = 7.6Wh (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.
Blackcell paid a fee to be moved to the front of the testing queue, which currently has a 10-12 week backlog. This cannot influence my test results as they pay in advance, have no say about what is in this report, and I don’t care if any company never does this or donates batteries again. My reputation is a lot more important than any battery donation or payment.
To see how other cells have tested check out this link: List of Battery Tests | E-Cigarette Forum
