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, EVE, Lishen, BAK, 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. It is a little better than the Samsung 40T and essentially equal to the Molicel P42A. The Molicel P45B and P50B, EVE 40PL, Ampace JP40, and Samsung 50S perform better (by varying amounts) than this cell but they can be a lot more expensive.
My thoughts and results below…
Continuous Current Discharge Graphs
Ratings and Performance Specs Graphic
18650 Ratings and E-Scores Table:
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20700/21700 Ratings and E-Scores Table:
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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: Get more from Battery Mooch on 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. It is a little better than the Samsung 40T and essentially equal to the Molicel P42A. The Molicel P45B and P50B, EVE 40PL, Ampace JP40, and Samsung 50S perform better (by varying amounts) than this cell but they can be a lot more expensive.
My thoughts and results below…
- DC IR measured 11.2mOhms and 11.4mOhms for two cells. This is fantastic consistency.
- Capacities were 4166mAh and 4179mAh, which is great consistency and significantly above its 4000mAh “nominal” rating. This is what it should be though for a 4000mAh rated cell in my opinion.
- This is not a “tabless” construction super-cell like the EVE 40PL, JP40, and others. It’s a standard high performance power cell in the Samsung 40T/Molicel P42A class.
- The 40P datasheet lists a 35A continuous and 50A temperature-limited rating (with a recommended 75°C cutoff and max 80°C cutoff). You can run this cell at up to 50A but never let it go over 80°C!
- Since this cell reaches 80°C at about 30A in my testing I am giving it an estimated 30A true continuous current rating. This is lower than EVE’s 35A rating but they are close and the difference can easily be caused by the use of different equipment and criteria for setting the rating.
- Standard charge rating is 2A and maximum is 6A.
- This cell has the China Compulsory Certification (CCC) required logo and printing on the wrap (polarity, capacity, model number). This is something we will most likely see on all the cells we use (eventually).
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: Get more from Battery Mooch on Patreon.
To see how other cells have tested check out this link: Links To All 21700, 26650, 18350, 18500 Battery Tests
