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AWT Yellow 40A 2600mAh 18650 Bench Test Results...only a 20A battery

Discussion in 'Batteries and Chargers' started by Mooch, Sep 13, 2015.

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  1. Mooch

    Mooch Electron Wrangler Verified Member ECF Veteran

    Supporting member
    May 13, 2015
    Tested at 10A-40A constant current. This cell was purchased from IMRBatteries by me and used only for testing. 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 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 batteries 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.jpg image.jpg image.jpg image.jpg


    Bottom Line
    In my opinion, this is a 20A continuous discharge current (CDR) cell with average capacity for its rating. I recommend not using it above 25A as it runs at a very high temperature at those current levels. At 40A the voltage completely collapses.

    Test Results
    image.jpg


    Comments
    • At 10A it reached about 2350mAh. This is a bit below average performance for a 2600mAh-rated cell.
    • At 15A the maximum temperature reached 67°C. This is too low for a cell operating at its CDR.
    • At 20A the maximum temperature reached 78°C. This is the average temperature for a cell operating at its CDR.
    • At 25A the temperature rose to 93°C. This is too high for a cell at its CDR.
    • Discharges at 30A and 35A were not done as it would have resulted in the cell temperature exceeding my 100°C safety limit.
    • A discharge at 40A was done though to show the performance of the cell at AWT's rating. Its voltage completely collapsed at this current level, rendering it essentially useless in my opinion. The only reason the temperature was the same as a 25A discharge is because the discharge ended so quickly.
    • Five additional cycles at 20A only showed about the same amount of damage a cell being operated at its CDR for several cycles would show.
    • The temperature at 20A matches the average for a cell operating at its CDR. I am setting a CDR of 20A for this cell. It is most certainly not a 40A cell.
    • To see how other cells have tested and how hard you can safely push them, check out the links in my signature.
     
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  2. pennysmalls

    pennysmalls Squonkmeister Verified Member ECF Veteran

    Supporting member
    Jul 26, 2013
    Indiana
    I was waiting for this, thank you Mooch. I'm going to pass this info on to my local B&M where they sell these as 40 amp batteries.
     
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