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MXJO Green/Silver 20A 3500mAh 18650 Bench Test Results...still an 11A/3300mAh battery

Discussion in 'Batteries and Chargers' started by Mooch, Dec 12, 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 image.jpeg


    Bottom Line
    This rewrapped cell has exaggerated current and capacity ratings and is the same as the older yellow wrap "20A 3500mAh" MXJO. When discharged continuously at its claimed 20A rating an internal protection device is triggered at around 100°C, permanently disabling the cell. This helps protect it from venting but renders the cell useless and means it cannot be rated a 20A cell.

    This new green/silver wrap has "Type 1" above "10A CDC" in small print on the "back" of the cell. I assume that means Continuous Discharge Current. While I applaud MXJO for putting this rating on the wrap, it's almost hidden and is essentially useless as very few people know what "CDC" means. In bold print on the front they have a meaningless 20A max or pulse rating with no mention of the continuous rating, which would be easy to add there. Even if they kept the continuous rating on the back of the cell they could have said "10A Continuous" or even "10A Cont." and used much larger lettering.

    These MXJO's are identical in appearance and performance to the 10A/3300mAh Panasonic NCR18650GA. I am rating them at 11A because they ran 3°C cooler than the 10A NCR18650GA's I tested. This MXJO's maximum vaping amps (MVA) rating is 15A, limited more by voltage sag than temperature rise. The 18650 ratings table has been updated to include this cell.

    The two cells tested were donated by Kai Chen from All Day Vapes (www.alldayvapes365.com). Thank you!


    Continuous-Current Test Results
    image.png


    Pulse-Current Test Results
    Pulse tests were not done since this is a NCR18650GA: Sanyo NCR18650GA 10A 3300mAh 18650 Bench Retest Results


    Comments
    • At 5A continuous it reached about 3135mAh. This is lousy performance for a 3500mAh cell but about average for a 3300mAh high internal resistance cell at 5A so I am rating it at 3300mAh.
    • At 10A continuous the temperature rose to 63°C. This is below the average temperature of a cell operating at its continuous discharge rating (CDR) but the capacity has already dropped to about 1750mAh at 3.2V.
    • At 15A continuous the temperature rose to 95°C. This is incredibly hot and clearly shows that we are operating at way above the cell's CDR.
    • At 20A continuous both cells failed at around 100°C. While a voltage could be read from both after they shut off they would not accept a charge and instantly plunged down to a fraction of a volt even if discharged at 1A. They were both rendered useless by a single discharge at the cell's 20A claimed rating.
    • I am setting a CDR of 11A for this cell. While operating any cell near its rated maximum current level causes damage to the cell, I would expect ok cycle life from this cell at 11A 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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