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Juicebox 22.5A 1500mAh 18650 Bench Test Results...a 20A 1600mAh battery

Discussion in 'Batteries and Chargers' started by Mooch, Feb 11, 2016.

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  1. Mooch

    Mooch Electron Wrangler Verified Member ECF Veteran

    Supporting member
    May 13, 2015
    Tested at 10A-25A constant current and 30A-50A pulsed. 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.

    Disclaimer
    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. My safety precautions are the ones I have elected to take and you should not assume they will protect you if you attempt to do any testing. Do the research and create your own testing methods and safety precautions.

    image.jpeg 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. Otherwise they would have listed the current rating with two numbers as other companies have done. Or they would have labeled the rating on the wrap as "pulse" or "burst". Battery buyers should not have to hunt down what the number on the wrap means. I will be testing batteries at the rating listed on the wrap and pointing out when they fail to meet that listed rating.


    Bottom Line
    In my opinion this is a 20A (continuous) 1600mAh battery. While it runs a bit longer than the 1500mAh HB2/4/6, its voltage at 20A is a lot lower.


    Continuous-Current Test Results
    image.png


    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.png image.png


    Comparison with HB2/4/6 and VTC4
    image.png


    Comments
    • At 10A it reached almost 1500mAh. This is fantastic performance for a 1500mAh-rated cell at 10A. I am giving this cell a capacity rating of 1600mAh.
    • Its temperature at 15A was 63°C, way below the average for a cell operating at its continuous discharge rating (CDR).
    • At 20A the temperature rose to 73°C. This is a few degrees below the average temperature of a cell operating at its CDR.
    • At 25A the temperature rose to 76°C. This is still a bit below the average temperature of a cell operating at its CDR. But the voltage was sagging a lot.
    • Seeing the large voltage sag at 25A, indicating that the battery was operating at beyond its rating, I did another two discharges at 25A. Both of these discharges showed clear damage being done to the battery even though the temperature was about 30°C lower than the point at which most 18650's get damaged.
    • Its temperature at its 22.5A rating would normally be what I call average for an 18650 operating at its CDR. But the quick and obvious damage it suffered at 25A tells me that it would still be damaged at 22.5A, although at a slower rate. I am setting a CDR of 20A for this cell. While operating any cell near its rated maximum current causes damage to the cell, I would expect decent cycle life from this cell at 20A.
    • 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 Safety Grades -- Picking a Safe Battery to Vape With | E-Cigarette Forum

    26650 Safety Grades and Pulse Performance Data | E-Cigarette Forum
     
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  2. sonicbomb

    sonicbomb Vaping Master Verified Member ECF Veteran

    Feb 17, 2015
    1187 Hunterwasser
    An accurate(ish) re-wrap, goodness gracious me.
     
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  3. Mooch

    Mooch Electron Wrangler Verified Member ECF Veteran

    Supporting member
    May 13, 2015
    And only $5!
     
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  4. dangaranga

    dangaranga Senior Member ECF Veteran

    Feb 15, 2015
    Metro Detroit, MI
    They aren't terrible batteries, i threw a set of them in my Reuleaux dna200 and direct swapping from HG2's i do notice the pack voltage sagging .2-.3v more than the lg browns at 80w.

    They still have been working decent for 1500mah batteries though, I'm not completely surprised by the 20a cont rating, from use i figured they'd test in that area
     
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