These tests below only note my personal opinion for the ESTIMATED ratings for the batteries I tested at the time I tested them. Any battery that is not a genuine Samsung, Sony, Murata, LG, Panasonic, Molicel, or Sanyo can change at any time! This can be 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 property damage, personal injury, or even death. Never use them outside of a fully protected battery pack and you use them at your own risk. Never exceed the battery’s true continuous discharge rating (CDR), never let it get colder than 0°C or hotter than 60°C, and keep the plastic wrap and top insulating ring in perfect condition. Never use a battery that is physically damaged in any way.
Testing batteries at their limits is dangerous and should never 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.
Test Results
This is a great performing cell for high power applications, beating the Samsung 50S and Molicel P42A at 30A. It doesn’t do as well as those cells at low to moderate power levels though. The Molicel P45B beats it at all power levels.
The T39 has a very low DC internal resistance (DC IR) so its voltage at the start is about as high as the Samsung 30T and Molicel P45B, making it a good choice for mechanical vaping devices where the cell can be recharged often (it “hits hard”).
Its continuous current rating seems to be in the 30A-35A range but like all cells I recommend not running it at/near its rating in order to extend cell life and reduce voltage sag.
There is a 50A “max” current rating on the wrap but there will be a lot of voltage sag at this level and you can’t run it for very long this hard. Don’t let the cell get over 60°C.
This cell looks a lot like the Lishen LR2170LA but it performs differently. The T39 is worse at 10A and better at 30A than the LR2170LA’s I tested. Their top contact structures are identical so it could be a Lishen but I don’t know for sure.
This cell has two plastic top insulating rings, which is great if you have a device that is rough on cell wraps and top rings. But this cell is about 70.7mm long, even longer than a Molicel P42A, and might not fit in devices that are a snug fit for Molicels. Its diameter is about 21.2mm.
The two cells I tested delivered 3968mAh and 4007mAh. This isn’t very good consistency but it is above this cell’s 3900mAh rating.
Continuous Current Discharge Graphs
Ratings and Performance Specs Graphic
18650 Ratings and E-Scores Table:
20700/21700 Ratings and E-Scores Table:
I want to work for the 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, battery testing and news, and a say in what I test, then please consider becoming a patron and supporting my testing efforts: Patreon.
To see how other cells have tested check out this link: Links To All 21700, 26650, 18350, 18500 Battery Tests
Misusing or mishandling lithium-ion batteries can pose a SERIOUS RISK of property damage, personal injury, or even death. Never use them outside of a fully protected battery pack and you use them at your own risk. Never exceed the battery’s true continuous discharge rating (CDR), never let it get colder than 0°C or hotter than 60°C, and keep the plastic wrap and top insulating ring in perfect condition. Never use a battery that is physically damaged in any way.
Testing batteries at their limits is dangerous and should never 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.
Test Results
This is a great performing cell for high power applications, beating the Samsung 50S and Molicel P42A at 30A. It doesn’t do as well as those cells at low to moderate power levels though. The Molicel P45B beats it at all power levels.
The T39 has a very low DC internal resistance (DC IR) so its voltage at the start is about as high as the Samsung 30T and Molicel P45B, making it a good choice for mechanical vaping devices where the cell can be recharged often (it “hits hard”).
Its continuous current rating seems to be in the 30A-35A range but like all cells I recommend not running it at/near its rating in order to extend cell life and reduce voltage sag.
There is a 50A “max” current rating on the wrap but there will be a lot of voltage sag at this level and you can’t run it for very long this hard. Don’t let the cell get over 60°C.
This cell looks a lot like the Lishen LR2170LA but it performs differently. The T39 is worse at 10A and better at 30A than the LR2170LA’s I tested. Their top contact structures are identical so it could be a Lishen but I don’t know for sure.
This cell has two plastic top insulating rings, which is great if you have a device that is rough on cell wraps and top rings. But this cell is about 70.7mm long, even longer than a Molicel P42A, and might not fit in devices that are a snug fit for Molicels. Its diameter is about 21.2mm.
The two cells I tested delivered 3968mAh and 4007mAh. This isn’t very good consistency but it is above this cell’s 3900mAh rating.
Continuous Current Discharge Graphs
Ratings and Performance Specs Graphic
18650 Ratings and E-Scores Table:
18650 Battery Ratings and Performance Table
You are responsible for your own safety! These batteries are designed, manufactured, and sold only for use in a battery pack with the proper protection circuitry and battery management system. They were not designed for vaping (electronic...
www.e-cigarette-forum.com
20700/21700 Ratings and E-Scores Table:
21700 Battery Ratings and Performance Table
You are responsible for your own safety! These batteries are designed, manufactured, and sold only for use in a battery pack with the proper protection circuitry and battery management system. They were not designed for vaping (electronic...
www.e-cigarette-forum.com
I want to work for the 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, battery testing and news, and a say in what I test, then please consider becoming a patron and supporting my testing efforts: Patreon.
To see how other cells have tested check out this link: Links To All 21700, 26650, 18350, 18500 Battery Tests
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