Docan Black 35A 3000mAh 18650 Bench Test Results...a hugely overrated rewrap

Discussion in 'Batteries and Chargers' started by Mooch, Apr 6, 2017.

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  1. Mooch

    Mooch Electron Wrangler Verified Member ECF Veteran

    Supporting member
    May 13, 2015
    To prevent any confusion with the eGo-type "batteries", I use the term "cell" here to refer to a single 18350, 18650, 26650, etc.

    While the test results are hard data, the conclusions and recommendations I make based on these tests are only my personal opinion based on my criteria for setting a rating. Carefully research any cell you are considering using before purchasing.

    Testing cells at their limits is dangerous and should never, ever, be attempted by anyone who has not thoroughly studied the dangers involved and how to minimize them.

    If the cell has only one current rating number on it, or if it says "max" then I have to assume that the company is stating that the cell can be discharged at that current level in any way, including continuously.

    IMG_4875.JPG IMG_4876.JPG IMG_4877.JPG IMG_4878.JPG


    Bottom Line
    This Docan is incredibly overrated. At 30A continuous, 5A below this cell's rating, it became hot enough to boil water.

    This Docan's appearance is identical to the Samsung 30Q. It's discharge curve is the same as the 30Q's but this cell performs a tiny bit worse.

    I am rating this Docan at 20A and 3000mAh. Its maximum vaping amps (MVA) rating is 25A, limited by temperature. The 18650 ratings table has been updated to include this cell.


    Continuous-Current Test Results
    IMG_4879.PNG


    Pulse-Current Test Results
    No pulse tests were done as this is a rewrapped 30Q


    Always Remember
    - There is no 18650 that can have a factory/manufacturer rating over 30A.

    - There is no 3000mAh 18650 that can have a rating over 20A.

    - There is no 3100mAh-3600mAh 18650 that can have a rating over 10A.

    - There is no 18650 with a capacity rating over 3600mAh.


    Comments
    At 10A continuous this cell delivered a bit more than 2700mAh. This is below the average for a 3000mAh cell but just within limits so I am rating it at 3000mAh.

    At only 30A continuous, 5A below the cell's rating, it delivered less than 500mAh down to 3.2V and reached over 100°C. This is an astoundingly high temperature. This is clearly not a 35A cell.


    To see how other cells have tested and how hard you can safely push them, check out these links:
    List of Battery Tests | E-Cigarette Forum
    https://www.e-cigarette-forum.com/f...afety-grades-and-pulse-performance-data.7566/
    https://www.e-cigarette-forum.com/f...des-picking-a-safe-battery-to-vape-with.7447/
    https://www.e-cigarette-forum.com/f...fety-grades-and-pulse-performance-data.7554//
     
    Rossum, david4500, nvadave and 2 others like this.
  2. sonicbomb

    sonicbomb Vaping Master Verified Member ECF Veteran

    Feb 17, 2015
    1187 Hunterwasser
    Off to liars purgatory for you Docan.
     
  3. SteveS45

    SteveS45 Vaping Master ECF Veteran

    Jan 27, 2016
    Long Island, New York
    Never even seen or heard of these yet but I guess they will make the news one of these days. Thanks for the tireless work Mooch!
     
    sonicbomb likes this.

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