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Bench Test Results: Listman 40A 3800mAh 21700...only 30A but good performing battery

Discussion in 'Batteries and Chargers' started by Mooch, Jun 13, 2018 at 9:11 AM.

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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, LG, Panasonic, 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.

    63445382-BEA5-4058-9883-C4C0E4DC7E50.jpeg D1E706BD-BBF8-43EE-A691-D530EBFBC770.jpeg 8D849239-6396-48DB-9E57-BD77793112CA.jpeg D722F2FF-492C-4899-B78D-12E5CD2971BB.jpeg


    Bottom Line
    While this cell has an exaggerated current rating is it a good performer. It is identical in appearance and similar in performance to the Golisi S35 and Efest 35A 3700mAh 21700’s.

    Both of these Listman cells had a bit over 4000mAh capacity. While this is a good thing it indicates that this cell might not be the exact same cell as used by Golisi and Efest.

    Upon learning that this cell had an exaggerated rating, iJoy (the ones who donated the cells for testing) told me that they will instruct the factory to change the rating on the wrap from 40A to 30A. While I would definitely prefer that a cell was tested and rated accurately before being sold I am glad that iJoy is willing to change the exaggerated current rating.

    There are earlier versions of this cell with a useless 60A “pulse” rating on the wrap. This was a ridiculous rating and I am glad it was removed.

    I am estimating this cell’s ratings at 30A and 3800mAh minimum, though you might get more capacity from them than that.

    Two cells were donated for the purposes of testing by iJoy (IJOY - The World Leading Vape Manufacturer-Avenger/Diamond/Captain/Capo/20700). Thank you!


    Continuous Current Discharge Graph
    B3B8F2A8-0F33-498F-B6E5-981F54EB3204.jpeg


    Ratings Graphic
    D71261FF-1E5E-412C-BC09-D93C03AEF91D.jpeg


    Performance Specs
    DC Internal Resistance = 16.3mOhms (milliohms) average for the two cells.
    Total energy delivered down to 3.2V at 10A continuous = 10.5Wh (Watt-hours) average
    Total energy delivered down to 3.2V at 20A continuous = 8.2Wh (Watt-hours) average
    Total energy delivered down to 3.2V at 30A continuous = 5.5Wh (Watt-hours) average

    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
     
    • Like Like x 6
  2. Heartsdelight

    Heartsdelight Vaping Master ECF Veteran

    Nov 10, 2015
    Thanks again Mooch!
     
    • Like Like x 1
    • Agree Agree x 1
  3. Derek Cross

    Derek Cross Senior Member ECF Veteran

    May 16, 2015
    Well its good to know there are more options coming along to fit in my squeezers and Furyan mech squonkers. Sooner or later I'll pick up a tube that accommodates all the newer cell sizes, but until then, these 2x700's are kicking ... in my squonk mods and the extra capacity really makes all the difference.

    Too bad we don't know for sure who is making these. I believe the Efest 21700 battery I'm so fond of is a rewrap of the Golisi, but isn't the Golisi a rewrap too? If so, who is the main manufacturer?

    Just typing out loud Mooch, so no need to answer those questions as I know your SUPER busy. Just curious myself.

    Thanks for this one. I will be taking to the Googles to search this one out! I'm a battery junkie which is good since I run a lot of unregulated mods. Recycling out my older cells is just as important to me as making sure my wraps are kept in tip-top shape!
     
    • Winner Winner x 1
  4. mimöschen

    mimöschen Super Member ECF Veteran

    Jul 15, 2016
  5. sonicbomb

    sonicbomb Vaping Master Verified Member ECF Veteran

    Feb 17, 2015
    1187 Hunterwasser
    It's not the good performance but the lies that hurt the most
     
  6. mimöschen

    mimöschen Super Member ECF Veteran

    Jul 15, 2016
    At least they listened and changed their ratings accordingly. Not a lot of companies act like that.
     
  7. Mooch

    Mooch Electron Wrangler Verified Member ECF Veteran

    Supporting member
    May 13, 2015
    They’re all, I believe, a wrapping of a China-manufactured cell. I don’t know who makes it though.
     

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