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Bench Test Results: Pre-production Samsung 50E2 9.8A 4900mAh 21700...great battery!

Discussion in 'Batteries and Chargers' started by Mooch, Nov 22, 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.

    3739225C-A76C-4AC4-A5C0-DD6A0ECE4E15.jpeg 151A1789-A785-4D94-91DB-55EE0915D958.jpeg 6997322D-6DF7-434A-924C-BE0D7B7E9A97.jpeg D377B17B-F845-4196-9A18-EB77502311FD.jpeg


    Bottom Line
    These are not the Samsung 50E pre-production samples that are floating around and rewrapped by some companies. The 50E2 is a much better performing later release of the 50E indicated by a “2” in the lower left corner of the printing on the wrap.

    It’s similar to what Samsung did with the 25R. There was the blue-wrapped 25R2, then the green-wrapped 25R5, followed by the green-wrapped 25R6. Each one having a tweak to its performance.

    I do not know if these will end up being the cells Samsung uses for production or if they will make additional tweaks but I am very impressed with the performance improvements over the 50E. Their internal resistance is very low which helps keep temperatures down and the voltage up, increasing the energy this cell can deliver.

    This is an accurately rated, great performing ultra-high capacity 21700 cell. The datasheet lists the minimum capacity at 4753mAh and standard capacity of 4900mAh. The two 50E2’s I tested delivered 5051mAh and 5062mAh at 1A (0.2C) down to 2.5V. The DC internal resistance measured 20.7mOhms and 20.8mOhms. This is astounding consistency and fantastic to see.

    The DC internal resistance of these cells is the same as a lot of the 20A 18650’s we use. But the current rating of the 50E2 is limited by its 60°C operating temperature limit. You cannot operate these at high current levels or temperatures. However, the low internal resistance of the 50E2 makes it a great performer.

    This Samsung 50E2 outperforms the (earlier) Samsung 50E, the Samsung 48G, and the LG M50 samples I recently purchased (more about the M50 later). I do not know when the 50E2 will be available for sale or who will carry it but I hope it is soon.

    I am rating the Samsung 50E2 at 10A/30W and 4900mAh. I will be retesting these again when they reach full production.

    Two cells were donated for the purposes of testing by ENERdan GmbH (Home -). Thank you!


    Continuous Current Discharge Graphs
    0C7FFD96-7BD1-4CF6-A850-98D09CD8095D.jpeg 97654B01-55AA-4C86-82EF-9A76A00CAB49.jpeg


    Ratings Graphic
    C1CDF327-A285-4FB5-A4AE-81D8298F2B67.jpeg


    Performance Specs
    - DC Internal Resistance = 20.8mOhms (milliohms) average for two cells.
    - Total energy delivered down to 3.2V at 5A continuous = 13.7Wh
    - Total energy delivered down to 3.2V at 10A continuous = 12.2Wh

    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
     
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  2. Heartsdelight

    Heartsdelight Vaping Master ECF Veteran

    Nov 10, 2015
    Happy Thanksgiving Mooch! May you & yours be filled with joy!
     
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  3. Robin Becker

    Robin Becker Senior Member

    Feb 3, 2018
    Berlin
    I don´t know, what about you guys, but my next 48V battery for my eBike will be assembled for sure with those batteries :D 20A on 2P with 10Ah and 40A on 4P with 20Ah...my Bafang motor starts to hum...
     
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  4. Mooch

    Mooch Electron Wrangler Verified Member ECF Veteran

    Supporting member
    May 13, 2015
    Thank you and the same to you!
     
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