AOSO 20A 3200mAh 18650 Bench Test Results...actually 20A but overrated capacity

Discussion in 'Batteries and Chargers' started by Mooch, Aug 22, 2016.

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  1. Mooch

    Mooch Electron Wrangler Verified Member ECF Veteran

    Supporting member
    May 13, 2015
    These cells were purchased by me for the purposes of testing. 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.

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    Bottom Line
    I was stunned to see that Aosibo gave this cell an accurate current rating. As usual though they still exaggerated one or more of the ratings. This is a 3000mAh cell, not 3200mAh. It looks and performs like the LG HG2. I am giving this cell a maximum vaping amps (MVA) rating of 25A.

    The 18650 ratings table has been updated to include this cell.


    Continuous-Current Test Results
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    Pulsed-Current Test Results
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    Comments
    • At 10A continuous it reached 2713mAh. This is terrible performance for a 3200mAh cell but about average for a 3000mAh cell at 10A so I am rating this cell at 3000mAh.
    • At 15A continuous the temperature rose to 73°C. This is below the average temperature of a cell running at its continuous discharge rating (CDR).
    • At 20A continuous the temperature rose to 82°C. This is just above the average temperature of a cell running at its CDR, but still within limits, and an indication that we are near the cell's true rating.
    • At 25A continuous the temperature rose to 99°C. This is a ridiculously high temperature and an indication that we are significantly above the cell's true rating.
    • I am setting a CDR of 20A 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 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
     
    Baditude and Vinnybagodoughnuts like this.

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