This is an accurately rated, good performing ultra-high capacity 21700 cell. It is identical in appearance, performance, and operating temperature to the Samsung 50E but Efan strongly denies that is it a rewrapped 50E. They say it is a cell made by them.
The Efan datasheet lists the minimum capacity at 4780mAh and nominal capacity at 5000mAh. The four Eizfan’s I tested delivered 5006mAh-5010mAh at 1A (0.2C) down to 2.5V. This is astounding consistency and they all easily meet their minimum capacity rating. This consistency is typical of good OEM cells from Samsung, Sony, LG, etc., but is better than any China manufactured cell I have seen so far.
This Eizfan outperforms the Samsung 48G but I have not tested the LG M50 yet so I can’t compare them.
There is a “15A” number on the wrap and the datasheet claims a “Max short time discharging current” rating of 15A but the time is not listed and the criteria used to set the rating are unknown. Therefore it is a useless rating.
I am rating this Eizfan at 10A/30W and 5000mAh. I will be retesting these again at some point to confirm they have not changed what cell they are wrapping.
Four cells were donated for the purposes of testing by Efan (https://efantech.en.alibaba.com). Thank you!
Ratings graphic: https://imgur.com/a/asfYR6D
Test report: https://bit.ly/2DEyfJv
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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.
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