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Bench Test Results: Efest 10A 5000mAh 21700...only 7.3A 4900mAh but good performer, probably LG M50

Discussion in 'Batteries and Chargers' started by Mooch, Jul 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, 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.

    C867B415-D9D1-4FE1-A18D-4D9807D4B3B0.jpeg 91E842FC-F169-4BA2-85F3-DFB5B73AEA1B.jpeg E5D63974-A078-4ED5-9B95-EC7F2F212463.jpeg 96FD451C-2101-4772-A9EA-652439B15809.jpeg

    Bottom Line
    Though Efest has overrated this cell a bit it is a good performer, beating the 10A Samsung 48G and 15A Sanyo NCR20700B for total vaping time at low power levels, under 7A/20W. It appears to be a rewrap of the LG M50 cell.

    The two cells I tested delivered 4900mAh and 4957mAh at 1.0A (0.2C) down to 2.5V. Neither cell met its 5000mAh rating. Every cell should easily beat the capacity spec as it’s just a minimum guaranteed value. It should not be the maximum you can expect if you’re lucky.

    LG rates the M50 at 4849mAh minimum to 5014mAh typical though so this Efest still meets LG’s specs.

    I am estimating this Efest’s ratings to be 7.3A and 4900mAh.

    Two cells were donated for the purposes of testing by Brad’s Vapor (Brad's Vapor). Thank you!

    Continuous Current Discharge Graphs
    E29DFCB2-3FE4-46DE-8E39-CD83813C01E6.jpeg 7ED92161-BB15-4FC8-8A13-33EF009EEE73.jpeg

    Ratings Graphic

    Performance Specs
    - DC Internal Resistance = 34.2mOhms (milliohms) average for the two cells.
    - Total energy delivered down to 3.2V at 5A continuous = 13.4Wh (Watt-hours) average
    - Total energy delivered down to 3.2V at 10A continuous = 10.5Wh (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 3
    • Agree Agree x 1
  2. sonicbomb

    sonicbomb Vaping Master Verified Member ECF Veteran

    Feb 17, 2015
    1187 Hundertwasser
    For now...
    I don't mean to depreciate any of the fantastic and valuable work you do for us Mooch, but I wouldn't trust an Efest rewrap any further than I could spit it.
    • Like Like x 1
    • Funny Funny x 1
  3. mimöschen

    mimöschen Ultra Member ECF Veteran

    Jul 15, 2016
    Hmm. Vaping contests get quite boring nowadays. Seems we've got a new discipline. Efest-battery-spitting-contest!:thumbs:
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