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Kdest Black 35A 2500mAh 18650 Bench Test Results...ridiculously overrated, one was a dud

Discussion in 'Batteries and Chargers' started by Mooch, Dec 4, 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 image.jpeg


    Bottom Line
    This is a rewrapped and ridiculously overrated 20A 2500mAh cell. In addition, one of the two that I purchased from Kdest was a dud cell (see test graph below). The one I could test performed close to, but worse than, the blue Samsung 25R5. Both Kdest cells were visually identical to the 25R2 (not the newer green 25R5).

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

    I am giving this cell a Maximum Vaping Amps (MVA) rating of 25A but it does not perform well at this level. Pulse testing was not done as this is a rewrapped 25R2. 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 Comparison to 25R5
    image.png


    Dud Cell Test Results
    image.png


    Comments
    I am setting a CDR of 20A for this cell. While operating any cell near its rated maximum current level causes damage, I would expect ok cycle life at 20A continuous. If you don't get a dud cell, that is.

    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//
     
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  2. Joergl100

    Joergl100 Super Member

  3. Mooch

    Mooch Electron Wrangler Verified Member ECF Veteran

    Supporting member
    May 13, 2015
    Enooks are supposed to be on the way to me now. Hopefully tested before the end of the year.
     
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  4. Joergl100

    Joergl100 Super Member

    Enook sounds like an eskimo boy like Nanook...Frank Zappa - Apostrophe'[​IMG]

    I am curious about the results. They write something like 3600 mAh...impossible...and 35 Amps! OhMyGod. The earth is flat...like a pancake.

    Don't eat that yellow snow...
     
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