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Basen 35A 2800mAh Retest Results...there are two versions, this one is 21A/2500mAh

Discussion in 'Batteries and Chargers' started by Mooch, Mar 5, 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. Thank you! To prevent any confusion with the eGo-type "batteries", I use the term "cell" here to refer to a single 18650, 26650, etc.

    The statements, conclusions, and recommendations I make based on these tests are only my personal opinion. Carefully research any battery 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.

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

    A note regarding current ratings and my testing
    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 continuous.

    Bottom Line
    There are two versions of this cell. The older version was untestable due to dud cells. This newer version has a slightly different wrap, without "80A" on it. It tested out as a 21A 2500mAh battery, delivering about 30% less capacity than a Samsung 25R5 at 20A down to 3.2V. This Basen's pulse performance was poor, dropping to about 3.15V on the first pulse at 30A.

    Continuous-Current Test Results

    Pulsed-Current Test Results
    These tests are done to show the performance of the cell at higher pulsed current levels. If you are running your mod at these levels be aware that you risk overheating, and possibly venting, the battery if there is a malfunction or accidental pressing of your mechanical mod's button.
    image.jpeg image.jpeg

    Comparison of older and newer version battery wraps

    • At 10A continuous it reached almost 2200mAh. This is terrible performance for a 2800mAh-rated cell operating at 10A so I am rating this cell at 2500mAh.
    • Its temperature at 15A was 63°C, way below the average for a cell operating at its CDR.
    • At 20A the temperature rose to 76°C. This is just below the average for a cell operating at its CDR.
    • At 25A the temperature rose to 90°C. This is several degrees above the upper limit for a cell operating at its CDR. Voltage sag is becoming more visible at the start until the battery warms up.
    • At 30A the temperature rose to 96°C. This is way too hot a temperature for a cell operating at its CDR. There is also a lot of voltage sag.
    • At the 35A rating Basen gave this cell the temperature rose to 101°C. This is a ridiculously high a temperature for a cell operating at its CDR. The voltage almost instantly dropped below 3.2V and the loss in capacity was significant.
    • I am setting a CDR of 21A for this cell since at this current level its operating temperature is at 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 21A.
    • 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 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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