This cell runs a bit cooler at its 24A rating than other 21700’s at their ratings and appears to be the same China-manufactured cell as the “40A” 3750mAh S35 from Golisi that I rated at 30A. Seems that Vapcell has decided to rate this cell conservatively. I applaud this decision and wish that more companies were willing to do this instead of exaggerating ratings to increase sales.
Our relentless desire for higher current ratings has caused the huge glut of batteries with exaggerated ratings being released as those companies try to tap into our desires. Rating a battery more conservatively not only gives us more realistic expectations for the capabilities of our batteries but increases safety and the overall life of the battery. The battery also operates more efficiently and this wastes less power inside the battery as heat. All good things.
The Vapcells tested out to a lower capacity than the Golisi cells I tested earlier but there isn’t much of a difference down to 3.2V, about the lowest we go. The differences only became really noticeable as the discharge approached my 2.5V testing cutoff voltage.
China-manufactured cells do have more variation in capacity than the ones from Samsung, Sony, LG, and Panasonic/Sanyo so this difference between the Vapcells and Golisi might not be present in all of their cells.
I am rating this cell at 24A and 3500mAh. I won’t recommend using a battery at above the manufacturer’s/wrapper’s rating but this Vapcell runs cooler at its rating than the Golisi does at its 30A rating and they appear to be the same cell.
Two cells were donated for the purposes of testing by Vapcell (www.vapcelltech.com). Thank you!
Ratings graphic: https://imgur.com/a/HA02V
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 the tables can change at any time as different grade cells appear on the market or we get swamped with fakes. Please, never assume that the ratings in the table 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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