This is an accurately rated high capacity cell that performs well up to about 10A-15A/30W-45W or so. Above that and the Golisi S35 3750mAh or Efest 3700Ah 21700’s are better performers due to their lower internal resistance.
It seems to be the same cell as used by the overrated Basen 30A 4000mAh 21700.
While it has the continuous rating marked on the wrap it also has a useless “max pulse” rating. This is a shame as it is accurately rated otherwise.
The two cells I tested delivered 4125mAh and 4243mAh at 0.5A down to 2.5 V, over their 4000mAh rating. While this is typical for Samsung, Sony, LG, Panasonic, and Sanyo cells I don’t often see it for others.
It’s great though and I encourage other cell wrapping companies to stop using the highest capacity they find for a group of cells for their rating. The rating should be lower than the lowest capacity delivered by any cell, i.e., it should be a minimum capacity rating. It appears that this is what MXJO did.
I am estimating this cell’s ratings to be 20A and 4000mAh.
Two cells were purchased for the purposes of testing by me.
Ratings graphic: https://imgur.com/a/gIIqLbH
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These tests 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” batteries 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 continuous current rating and keep the plastic wrap and top insulating ring in perfect condition.
Any rating in my ratings tables can change at any time as different grade cells appear on the market, we get swamped with fakes, or new information becomes available to me. Please, never assume that the ratings in the tables are permanent and will never change! Always download the latest version before considering any cell purchase.
To see how other cells have tested check out this link: https://www.e-cigarette-forum.com/forum/blog-entry/list-of-battery-tests.7436/
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