This cell DOES NOT use the same good performing Yong De Li New Energy Company YDL 26650D cell that other companies also wrap. This Efest is a very poor performer with hugely exaggerated current ratings.
The authenticity of these cells was verified at Efest’s web site.
The DC internal resistance of these cells is almost 50% higher than the 26650’s using the YDL cell. This means the voltage sag will be a lot larger with these Efests when above about 10A/30W.
At 90W the 26650’s using the YDL cell would give you about 125 two second puffs. This Efest would give you about 12 puffs…yes, just 12. At its preposterous claimed 50A “max pulse discharge” rating, about 150W, this Efest wouldn’t even give you one puff. At 50A this cell’s voltage almost instantly dropped to my 2.8V cutoff. I am giving these Efests a 20A rating.
The capacity for the two Efests I tested was 4518mAh and 4614mAh at 840mA (0.2C) down to 2.5V. This is typically poor consistency for a China manufactured cell but these cells easily meet their 4200mAh rating. I am rating this cell at 4200mAh to prevent confusion but these are clearly higher capacity cells. This would NOT help them perform better than the 26650’s using the YDL cell except at very low power levels, about 20W or lower. There are better choices for lower power levels though.
Two cells were purchased for testing by me.
Ratings graphic: https://imgur.com/a/dpYAo69
Full Test report: https://bit.ly/36rGymc
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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, Murata, LG, Panasonic, Molicel, 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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