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Bench Test Results: MXJO 20A 4000mAh 21700...accurately rated, good 30W-35W battery

Discussion in 'Batteries and Chargers' started by Mooch, Jun 9, 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, 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.

    0F64932B-E1DC-4E88-88C8-6D971665DC72.jpeg BB74C64D-AE56-42A9-A61E-FBC956D43EE0.jpeg C8F86332-E03E-4729-B94E-A346691DDCB1.jpeg F576B236-8DD0-4293-9B5A-9C5460CB9346.jpeg 23085AB9-3878-41F2-AFE2-5954A2507CBD.jpeg


    Bottom Line
    This is an accurately rated high capacity cell that performs well up to about 10A-15A/30W-45W or so. Above that and the Golisi S35 3750mAh or Efest 3700Ah 21700’s are better performers due to their lower internal resistance.

    It seems to be the same cell as used by the overrated Basen 30A 4000mAh 21700.

    While it has the continuous rating marked on the wrap it also has a useless “max pulse” rating. This is a shame as it is accurately rated otherwise.

    The two cells I tested delivered 4125mAh and 4243mAh at 0.5A down to 2.5 V, over their 4000mAh rating. While this is typical for Samsung, Sony, LG, Panasonic, and Sanyo cells I don’t often see it for others.

    It’s great though and I encourage other cell wrapping companies to stop using the highest capacity they find for a group of cells for their rating. The rating should be lower than the lowest capacity delivered by any cell, i.e., it should be a minimum capacity rating. It appears that this is what MXJO did.

    I am estimating this cell’s ratings to be 20A and 4000mAh.

    Two cells were purchased for the purposes of testing by me.


    Continuous Current Discharge Graph
    EB6EE6D8-C5E8-480A-A641-8711758AA976.jpeg 51728A53-649C-4391-8598-95119BA30D51.jpeg


    Ratings Graphic
    6BFC13C9-FE79-460E-A0DF-D3264FB472C3.jpeg


    Performance Specs
    - DC Internal Resistance = 22.0mOhms (milliohms) average for the two cells.
    - Total energy delivered down to 3.2V at 10A continuous = 11.6Wh (Watt-hours) average
    - Total energy delivered down to 3.2V at 20A continuous = 6.7Wh (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
     
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