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 the one of the best performing round cells I’ve ever tested for moderate to extreme high power applications. In early testing it’s not quite as good a performer as what appears to be the Ampace JP40 (still need unaltered factory wrapped cells to test) but they’re close.
The Molicel P50B performs a bit worse than the 40PL and JP40 but runs at a much steadier voltage at extreme power levels, has incredibly long cycle life at high power levels, and has a 25A charge rating. I’m still testing the cycle life of the 40PL and JP40 but neither have shown early signs of being “fragile” (short cycle lives).
My thoughts and results below…
Continuous Current Discharge Graphs
Ratings and Performance Specs Graphic
18650 Ratings and E-Scores Table:
www.e-cigarette-forum.com
20700/21700 Ratings and E-Scores Table:
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
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 the one of the best performing round cells I’ve ever tested for moderate to extreme high power applications. In early testing it’s not quite as good a performer as what appears to be the Ampace JP40 (still need unaltered factory wrapped cells to test) but they’re close.
The Molicel P50B performs a bit worse than the 40PL and JP40 but runs at a much steadier voltage at extreme power levels, has incredibly long cycle life at high power levels, and has a 25A charge rating. I’m still testing the cycle life of the 40PL and JP40 but neither have shown early signs of being “fragile” (short cycle lives).
My thoughts and results below…
- DC IR averaged 5.1mOhms for two cells vs 5.4mOhms for the LT22710A (Ampace JP40?)…essentially identical. It was about 9.5mOhms for the Molicel P50B.
- Capacities were 4086mAh and 4120mAh, not great consistency but not terrible. This is about what it should be though for a 4000mAh minimum-rated cell in my opinion.
- At high power levels the 40PL runs at a slightly higher voltage (“hits harder”) for bit at the start but then the LT22710A (Ampace JP40?) runs a bit higher.
- These are not huge performance differences and might not be noticeable in “real world” use.
- The 40PL and LT22710A (Ampace JP40?) run at about the same temperature at high power levels.
- The 40PL datasheet only lists a 70A temperature-limited rating (with a recommended 75°C cutoff and max 80°C cutoff). Never let this cell go over 80°C!
- Since this cell reaches 80°C at a bit over 45A in my testing I am giving it an estimated 45A true continuous current rating.
- For discharging at low power levels, about 5A and lower, the Samsung 50S, BAK N21700CG-50, Molicel P50B, and LG M50LT will all run for a bit longer. But for up to about 70A this cell is incredible.
- Padja, a highly respected tester over at the Endless-Sphere forums, had poor cycle life results late last year with what was probably a pre-production cell (https://endless-sphere.com/sphere/threads/tabless-design-cylindrical-cells-tests.122072/). I’ve been abusively cycle life testing this cell for my Patreon supporters and so far it has held up well, about the same as other cells I am testing this way.
- Standard charge rating is 2A and maximum is 8A. If you need extremely fast charging then test the Molicel P50B, its max rating is 25A.
- EVE claims a 100A continuous current rating for this cell in their marketing materials (but 70A in the datasheet). I’ve done testing at 100A for my Patreon supporters (never exceeding 80°C limit) with this cell and others and it didn’t get noticeably damaged from this abuse. Cycle life will DEFINITELY be a lot shorter though if you consistently run this cell that hard!
- If pulsing at incredibly high current levels and you need consistent power output the P50B is the better choice in my opinion due to how flat its discharge curve is. But the P50B does run at a lower voltage though due to its higher internal resistance.
- If your application draws more than 50A-70A or so then I strongly recommend testing this cell, the Molicel P50B, and the Ampace JP40 to see which performs the best for you. I RECOMMEND NEVER GOING OVER THIS CELL’S 70A RATING THOUGH! It significantly increases the risks of using this cell, shortens cell life, and results in huge voltage sag,
- This cell has a spiral pattern on the bottom of the cell but it has an extra revolution compared to the spiral on the bottom of the JP40.
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
