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Shockli Blue 35A 3000mAh 18650 Bench Test Results...just a 20A battery, looks like a 30Q

Discussion in 'Batteries and Chargers' started by Mooch, Jul 10, 2016.

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  1. Mooch

    Mooch Electron Wrangler Verified Member ECF Veteran

    Supporting member
    May 13, 2015
    These cells were donated for the purposes of testing by Shockli. Thank you! 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 an overrated cell that I am rating at 20A/3000mAh. While the wrap does list both the continuous and pulse ratings, normally a very good thing, its claimed 35A continuous rating is wildly exaggerated. At 25A continuous, 10A below its claimed rating, it got almost hot enough to boil water, 97°C. It looks and performs almost identically to the Samsung 30Q.


    Continuous-Current Test Results
    image.png


    Pulsed-Current Test Results
    image.png image.png


    Comments
    • At 10A continuous it reached almost 2800mAh. This is average performance for 3000mAh cell at 10A so I am rating this cell at 3000mAh.
    • At 15A continuous the temperature rose to 67°C. This is way below the average temperature of a cell running at its continuous discharge rating (CDR).
    • At 20A continuous the temperature rose to 81°C. This is just a bit above the average temperature of a cell running at its CDR but within an acceptable range and is an indication that we are near the cell's true rating.
    • At 25A continuous the temperature rose to 97°C. This is a ridiculously high temperature and a strong sign that we're way above the cell's true rating.
    • Discharges at 30A and 35A (the cell's rating) were not done due to the excessively high temperature measured at 25A.
    • I am setting a CDR of 20A for this cell. Operating at that level would bring the temperature near to the average for a cell operating at its CDR. While operating any cell near its rated maximum current level causes damage to the cell, I would expect decent cycle life from this cell at 20A continuous.
    • I have included pulsed discharges but I haven't set pass/fail standards for pulse testing yet. The discharges were done at 5sec on/30sec off, down to 2.5V. One chart shows the entire discharge at each level. The other chart is zoomed in to show the first 5 minutes to make it easier to see the voltage sag at different current levels.
    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
    18350/18500 Safety Grades and Pulse Performance Data | E-Cigarette Forum
    18650 Battery Ratings -- Picking a Safe Battery to Vape With | E-Cigarette Forum
    26650 Safety Grades and Pulse Performance Data | E-Cigarette Forum
     
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