A BATTERY MOOCH POST: Early Samples: Molicel M42A 20A 4000mAh 20700…accurately rated, best 20700 up to 45W

Moli and NPE sent me several of these cells for testing and my thoughts about their performance. They were manufactured for one of Moli’s customers but Moli wants to make it available to other markets. This is just a sneak peek at what’s coming, they hope to ship them to the rewrapping companies by the first quarter of 2019. I will retest them when they start shipping to the rewrappers.

As of now, Moli won’t be making this cell directly available to us in its original wrapper due to existing agreements.

This is a great performing 20700 that fills a performance “hole” in the 20700’s we can buy. It outperforms the Sanyo NCR20700B at all power levels. It even outperforms the Molicel INR20700A (and its rewraps from Efest, Vapcell, and others) and the Golisi S32 (and others using that same China manufactured cell) at up to about 15A/45W. At about 20A/60W or higher though those other cells outperform the M42A.

This is a high capacity “energy” cell, best suited for up to moderate power levels. It is not a “power” cell made for higher discharge current levels, like the Molicel INR20700A.

The datasheet lists 20A as the max continuous current rating but notes that cycle life is reduced at high current levels. I recommend staying at 15Α/45W or lower with the M42A to get the best performance and longest life from this cell.

The datasheet lists the minimum capacity at 4000mAh and typical capacity at 4200mAh. The four Molicels I tested delivered 4100mAh – 4149mAh at 800mA (0.2C) down to 2.5V. This is pretty good consistency and they easily meet their minimum capacity rating.

I am rating this Molicel at 20A and 4000mAh.

Five cells were donated for the purposes of testing by Moli (http://www.molicel.com/hq/about/aboutus1.html) and N-Power Energy, Ltd. Thank you!

Ratings graphic: https://imgur.com/a/boqnqe1

Test report: https://bit.ly/2yC9NV2

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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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Author: John Muchow