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This VRK appears to use the same cell as Basen and CoilArt 21700’s, not a great performer. The Golisi S35 and Efest 3700mAh are better and have higher current ratings. Even the five “leg” top contact 20700’s from iJoy/Efest/EBAT/Ampking and others perform a little better and have higher current ratings too.
The 40A ”Max Discharge” rating on the wrap is useless as VRK doesn’t define what that means. Some type of “pulse” rating? We can’t use it to compare against any other cell unless we know the pulse width, time between pulses, and what criteria they use to set the rating (Temperature? Voltage sag? Cycle life? A combination of those?). That’s only if all the cell wrapping companies use the same pulses and criteria too.
The two cells delivered 4118mAh and 4116mAh at 0.5A down to 2.5V. I don’t know why VRK rated this cell at 3750mAh unless perhaps they are expecting to change cells or, for this batch, they switched over to a different one?
I am estimating this VRK’s ratings at 20A and 3750mAh. I’m not giving them a higher capacity rating due to the risk of the cell being changed.
Two cells were purchased for the purposes of testing by me.
Ratings graphic: https://imgur.com/a/7PLxxcg
Test report: https://bit.ly/2KkDr8y
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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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