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Kdest Beige 35A 2800mAh 18650 Bench Test Results...shamefully overrated, just a 10A battery!

Discussion in 'Batteries and Chargers' started by Mooch, Dec 5, 2016.

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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 discharging current" 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.

    image.jpeg image.jpeg image.jpeg image.jpeg


    Bottom Line
    This is a rewrapped and preposterously overrated 10A cell reaching 94°C at only 15A continuous and becoming useless at only 20A. Both Kdest cells were visually identical in performance and appearance to the LG MG1. This is the same cell that was used by Efest for the 10A version of their earlier "35A 3000mAh" cell.

    Kdest has printed "MADE IN KDEST" on the metal can which is interesting considering that this is a rewrapped LG cell.

    I am giving this cell a Maximum Vaping Amps (MVA) rating of 12A but it does not perform well at this level. The 18650 ratings table has been updated to include this cell.

    The two cells were purchased directly from Kdest (Kdest) for the purposes of testing.


    Continuous-Current Test Results
    image.png


    Pulse-Current Test Results
    image.png image.png


    Comments
    • At 10A continuous it reached 2542mAh. This is average performance for a 2800mAh high internal resistance cell at 10A so I am rating it at 2800mAh.
    • At 15A continuous the temperature rose to 94°C. This is way above the average temperature of a cell operating at its continuous discharge rating (CDR). This is an indication that we are operating above its true rating.
    • At 20A continuous the voltage very quickly dropped to 3.2V, delivering only 141mAh.
    • At 25A continuous and higher the battery was essentially useless. This is obviously not a 35A cell.
    • I am setting a CDR of 10A for this cell. While operating any cell near its rated maximum current level causes damage, I would expect ok cycle life at 10A continuous.
    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/forum/blog-entry/18350-safety-grades-and-pulse-performance-data.7566/
    https://www.e-cigarette-forum.com/forum/blog-entry/18650-safety-grades-picking-a-safe-battery-to-vape-with.7447/
    https://www.e-cigarette-forum.com/forum/blog-entry/26650-safety-grades-and-pulse-performance-data.7554//
     
    • Like Like x 2
  2. sonicbomb

    sonicbomb Vaping Master Verified Member ECF Veteran

    Feb 17, 2015
    1187 Hunterwasser
  3. Mooch

    Mooch Electron Wrangler Verified Member ECF Veteran

    Supporting member
    May 13, 2015
    It's disgusting.
     
    • Like Like x 1
  4. sonicbomb

    sonicbomb Vaping Master Verified Member ECF Veteran

    Feb 17, 2015
    1187 Hunterwasser
    The voltage sag may be the only thing saving someone from injury using this
     
  5. r77r7r

    r77r7r ECF Guru ECF Veteran

    Feb 15, 2011
    Pa,LandOfTaxes
    When I Gougled Kdest, Mooch's results were on the front page at least.
     
    • Like Like x 2
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