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Bench Test Results: Vapcell Black 30A 4000mAh 21700 with bottom QR code...Sony VTC6A rewrap

Discussion in 'Batteries and Chargers' started by Mooch, Aug 7, 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.

    FEC306B9-AE5A-45F1-A6F0-D8276B29D62B.jpeg F8D68ADA-010E-498B-B25A-21B762D78F7D.jpeg 7C3C2356-2329-4296-B409-A37617786CB9.jpeg 1F251862-F248-4990-BAD3-5D5689C469AD.jpeg

    Bottom Line
    This is an accurately rated rewrap of the 21700 size version of the Sony VTC6A. It performed essentially identically to the VTC6A I recently tested.

    The Samsung 40T delivers a tiny bit more energy, Wh, at high current levels but the VTC6A runs a tiny bit cooler. Basically, they perform the same and are a fantastic choice for use at up to 20A-25A, in regulated or unregulated devices. At above 20A-25A the Samsung 30T is the better choice though due to its higher current rating and better efficiency (lower internal resistance).

    The Vapcells I tested have a tiny QR code square on the bottom, same as the VTC6A’s I tested. There are versions of this Vapcell without the QR code though which I am testing now. If you have a VTC6A 21700, or one of its rewraps, that does not have this QR code it is probably just an earlier sample.

    The two cells I tested delivered 4113mAh and 4141mAh at 800mA (0.2C) down to 2.5V.

    I do not have the datasheet for this cell. I am TENTATIVELY ESTIMATING this Vapcell’s ratings to be 30A continuous and 4000mAh rated/minimum, 4100mAh typical/nominal.

    Two cells were donated for the purposes of testing by 18650batterystore (18650 Battery Store | 18650 Lithium Ion Batteries, Chargers and Wraps). Thank you!

    Continuous Current Discharge Graphs

    Ratings Graphic

    Performance Specs
    - DC Internal Resistance = 13.8mOhms (milliohms) average for the two cells.
    - Total energy delivered down to 3.2V at 10A continuous = 10.9Wh (Watt-hours) average
    - Total energy delivered down to 3.2V at 20A continuous = 9.8Wh (Watt-hours) average
    - Total energy delivered down to 3.2V at 30A continuous = 8.2Wh (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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