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Bench Test Results: Vapcell K25 – 20A 2500mAh 18650...equals Samsung 25R, ignore max rating

Discussion in 'Batteries and Chargers' started by Mooch, May 9, 2020.

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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 physically and electrically protected battery pack. Never exceed the battery’s current rating and keep the plastic wrap and top insulating ring in perfect condition. Use of any of these batteries is AT YOUR OWN RISK.

    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.

    Cell photos
    EBF9FF18-31C2-466C-81CD-2620F57AF401.jpeg ABAE7DAD-454C-4D75-8DCB-5E3F07EFED3F.jpeg 95001D05-9141-435B-A03C-4C6C4C2C407D.jpeg 6DE67839-5663-486E-B696-AEFED8406A47.jpeg

    Test Results
    The Vapcell K25 performs essentially the same as the Samsung 25R, an average performing 20A 2500mAh cell. These appear to be China-manufactured cells and the 20A rating seems reasonable.

    The 35A “max“ rating on the wrap cannot be used to compare these cells to any others. While Vapcell says they have done some testing the max rating was also set based on marketing needs.

    The capacity of the two cells I tested was 2517mAh and 2545mAh. This is decent consistency for China-manufactured cells and I am rating the K25 at 2500mAh.

    Two cells were sent for the purposes of testing by Vapcell ( Thank you!

    Continuous Current Discharge Graphs
    1133FE3C-31DB-4DD1-9536-DFEF6462E615.jpeg 0BF17595-6118-49DF-83F9-5D87DF274D88.jpeg

    Ratings Graphic

    Performance Specs
    • DC Internal Resistance = 19.0mOhms*** (milliohms) average for the two cells.
    • Watt-hours (energy) delivered at 30W (10A) down to 3.2V = 7.0Wh
    • Watt-hours (energy) delivered at 60W (20A) down to 3.2V = 4.9Wh
    • 2-sec puff count at 30W (10A) = 420
    • 2-sec puff count at 60W (20A) = 147
    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, battery and charger testing and 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

    A fee was paid for rush testing of these cells. This can not possibly change the results of my testing or my conclusions.

    ***I have switched test jigs, resulting in slightly lower IR readings versus my previous setup. Add 1.6mOhms to this IR value in order to compare these cells to others tested previously.
    • Informative Informative x 2
    • Like Like x 1
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