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MXJO Yellow 35A 3500mAh 26650 Bench Retest Results...exaggerated rating, just a 27A battery

Discussion in 'Batteries and Chargers' started by Mooch, Oct 17, 2016.

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  1. Mooch

    Mooch Electron Wrangler Verified Member ECF Veteran

    Supporting member
    May 13, 2015
    #7 in the MXJO series...

    These cells were purchased with funds donated by the vaping community 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 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 cell has exaggerated current rating but did a bit better than the last time I tested it. I am rating it at 27A/3500mAh. This cell is a decent performer, and runs a bit cooler than a lot of the other 26650's, but it has a lower capacity than most of the other good performers. I recommend staying below 20A/75W when vaping. It's maximum vaping amps (MVA) rating is 35A due to the large voltage sag at that level.

    The 26650 ratings table has been updated to include this cell.


    Continuous-Current Test Results
    image.png


    Pulse-Current Test Results
    image.png image.png


    Comments
    • At 10A continuous it reached about 3400mAh. This good performance for a 3500mAh 26650 at 10A so I am rating it at 3500mAh.
    • At 15A continuous the temperature rose to 56°C. This is way below the average temperature of a cell operating at its continuous discharge rating (CDR) and is an indication that we aren't near its true rating.
    • At 20A continuous the temperature rose to 65°C. This is still way below the average temperature of a cell operating at its CDR and is an indication that we aren't near its true rating.
    • At 25A continuous the temperature rose to 75°C. This is just below the average temperature of a cell operating at its CDR and is an indication that we are near its true rating.
    • At 30A continuous the temperature rose to 81°C. This is above the average temperature of a cell operating at its CDR and is an indication that we are above its true rating. The voltage is sagging considerably.
    • At 35A continuous the temperature rose to 86°C. This is way above the average temperature of a cell operating at its CDR and is an indication that we aren't near its true rating. The cell is only delivering a bit over 700mAh down to 3.2V due to the voltage sag.
    • At 40A continuous the temperature rose to 89°C. This is way too hot and the voltage quickly drops below useful levels,
    • I am setting a CDR of 27A for this cell. 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 27A 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//
     
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