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Bench Test Results, Early Samples: Molicel M42A 20A 4000mAh 20700...accurately rated, great 20700

Discussion in 'Batteries and Chargers' started by Mooch, Oct 26, 2018.

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  1. Mooch

    Mooch Electron Wrangler Verified Member ECF Veteran

    Supporting member
    May 13, 2015
    These tests below 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” 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 current rating and keep the plastic wrap and top insulating ring in perfect condition.

    Testing batteries at their limits is dangerous and should never, ever, be attempted by anyone who has not thoroughly studied the dangers involved, understands the risks, has the proper equipment, and takes all appropriate safety precautions.

    If the battery has only one current rating number, or if it only says "max", then I have to assume the battery is rated at that current level for any type of discharge, including continuous.

    4E8CDAD6-654A-439F-8B55-CD24D200B3F0.jpeg 0DCFF014-36F1-4065-B929-92993B7E2A7B.jpeg 3B5F7AD3-0BC0-4024-9339-A9AB983887BE.jpeg E7BBC925-641C-479B-B082-E80863E8308F.jpeg


    Bottom Line
    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 (Molicel-E-One Moli Energy Corp-Company Profile) and N-Power Energy, Ltd. Thank you!


    Continuous Current Discharge Graphs
    5FC75C5E-B82D-417C-985F-D2D6B69BFAEA.jpeg 07D75FCD-474E-4CCE-BFC9-7AF882AA79C6.jpeg A707D5B1-62C8-4594-8088-B5DF3BBED2F0.jpeg 39702CC2-693F-40FB-9B48-FC2B69CB22DC.jpeg


    Ratings Graphic
    DADADEBF-05AE-4E44-B790-403F7C26F4EA.jpeg


    Performance Specs
    - DC Internal Resistance = 23.1mOhms (milliohms) average for the two cells.
    - Total energy delivered down to 3.2V at 10A continuous = 11.2Wh
    - Total energy delivered down to 3.2V at 20A continuous = 8.0Wh

    I want to work for the vaping community full time! If you feel what I do is worth a couple dollars a month and you would like early access to battery availability and testing news and a say in what I test then please consider becoming a patron and supporting my testing efforts: Battery Mooch is creating battery tests and educating vapers | Patreon.

    To see how other cells have tested check out this link: List of Battery Tests | E-Cigarette Forum
     
    • Informative Informative x 3
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  2. Strtsmthng

    Strtsmthng Full Member

    Aug 15, 2018
    And yet another very interesting cell from Moli - personally I do wish they WOULD sell them in the original wrapper, though.

    As always many thanks for your great work Mooch!
     
    • Like Like x 1

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