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Efest Purple 35A 3000mAh 18650 Bench Test Results...only a 20A battery, equal to HG2 and 30Q though

Discussion in 'Batteries and Chargers' started by Mooch, Nov 5, 2015.

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  1. Mooch

    Mooch Electron Wrangler Verified Member ECF Veteran

    Supporting member
    May 13, 2015
    Tested at 10A-35A constant current and 30A-60A pulsed. These cells were purchased by me and used only for testing thanks to the incredible donations many of you made. 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 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 cell's 35A rating is wildly exaggerated.
    • But it is a great performing 20A continuous discharge current (CDR) high capacity cell.
    • It performs about the same as the LG HG2 and Samsung 30Q, including temperature.
    • It is badly damaged at its 35A rating though.

    A note regarding current ratings and my testing
    If the cell has only one current rating on it 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. Battery buyers should not have to go to the company's web site just to find out what the number on the wrap means. I will be testing cells at the rating listed on the wrap and pointing out when they fail to meet that listed rating. These Efest cells failed to meet the rating on their wraps by a huge margin.


    Continuous-Current Test Results
    image.jpg


    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.jpg image.jpg


    Comments
    • At 10A it reached about 2750mAh. This is average performance for a 3000mAh-rated cell at 10A.
    • At 15A the maximum temperature reached 67°C. This is below the average temperature of a cell operating at its CDR.
    • At 20A the maximum temperature reached 82°C. This is above the average for a cell operating at its CDR but within an acceptable range. Its temperature and capacity was the same as a LG HG2 and Samsung 30Q at 20A.
    • At 25A the temperature rose to 98°C. This is way too high for a cell operating at its CDR and is almost at my safety limit of 100°C.
    • A discharge at 35A was done to show the cell's performance at the rating on its wrap. The voltage quickly dropped to 3.3V and the temperature skyrocketed to 119°C by the end of the discharge. This is an unsafe temperature and this is clearly not a 35A cell!
    • After this first 35A discharge, another 35A discharge shows the huge amount of damage done to the cell after a single discharge at that current level.
    • Using another cell, doing three 20A discharges showed that no damage was being done to the cell at that current level.
    • I am setting a CDR of 20A for this cell. Its temperature is a bit high but equal to other cells I've tested at their CDR. 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 30A-60A, 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
    18650 Safety Grades -- Picking a Safe Battery to Vape With | E-Cigarette Forum
     
    • Like Like x 7
  2. Mooch

    Mooch Electron Wrangler Verified Member ECF Veteran

    Supporting member
    May 13, 2015
    Holy cell chemistry Batman...a great performing Efest!
    As usual though, wildly overrated.
     
    • Like Like x 2
  3. xcrazydx

    xcrazydx Super Member Verified Member ECF Veteran

    Feb 1, 2014
    United States
    Another predictable efest fail. Thanks, man.
     
  4. Mooch

    Mooch Electron Wrangler Verified Member ECF Veteran

    Supporting member
    May 13, 2015
    • Like Like x 2
  5. Cloud_Generator

    Cloud_Generator Senior Member Verified Member ECF Veteran

    Jan 22, 2016
    United States
    Well that
    Well that just sucks because I just bought 4 of these batteries. I have not received them yet though.
    How will I be able to tell if the ones that I bought are the 20 amp ones or the 10 amp ones?
    Thanks
     
  6. Topwater Elvis

    Topwater Elvis Vaping Master ECF Veteran

    Dec 26, 2012
    Texas
    That's the problem with efest and other companies that use dishonest marketing to sell batteries.
    There isn't any way for the average Joe to know/tell the difference.

    Best to treat them as 10a CDR.
     
    • Like Like x 2
  7. Cloud_Generator

    Cloud_Generator Senior Member Verified Member ECF Veteran

    Jan 22, 2016
    United States
    I will treat them as 10a. I didn't want to buy the efest but I ordered a bunch of stuff from vapenw and they were out of the good ones. I was told that they were really popular and that that they didn't get many complaints with them so I just went ahead with it.
    I will buy some better batteries soon.
     
  8. Susan~S

    Susan~S ECF Guru Verified Member ECF Veteran

    Mar 12, 2014
    Mpls/St.Paul, MN
    There are only a few battery manufacturers in the world who make their own "cells", including LG, Panasonic, Samsung, Sanyo, and Sony.

    All the other brands on the market buy the second and third tier cells from those manufacturers and re-wrap them under their own brand. These are "second and/or third tier cells" which did not meet the higher standards of the original manufacturer. So, in order to compete with the original manufacturers' batteries (first tier), these other companies feel obligated to publish specifications which are inflated to make them appear superior to those of the original manufacturer.

    * (AW is Andrew Wan, a former Panasonic employee who branched out to create his own "brand" of batteries. He allegedly has agreements with the major cell manufacturers to purchase first tier batteries from them. Not all batteries are created equal, so AW tests these batteries for quality. The best get chosen to be AW brand, and are re-wrapped as AW.)

    Do your research before you buy. Decide what battery to buy depending upon the application that you will use them.

    Here are several reputable battery suppliers in the US.
     
    • Like Like x 2
  9. Mooch

    Mooch Electron Wrangler Verified Member ECF Veteran

    Supporting member
    May 13, 2015
    The 10A ones have a smaller three-leg metal top cap . If you can post a clear picture of the tops of your batteries I might be able tell you which version you have.
     
  10. Cloud_Generator

    Cloud_Generator Senior Member Verified Member ECF Veteran

    Jan 22, 2016
    United States
    I have to figure out a way to get a picture on here. I don't have a computer yet and I am currently using a first generation iPad but as soon as I can I will

    Thank you!
     
    • Like Like x 1
  11. Cloud_Generator

    Cloud_Generator Senior Member Verified Member ECF Veteran

    Jan 22, 2016
    United States
    I just received my batteries in the mail and it appears to have 4 post on top not three like the one you have pictured in your review. What does that mean?
     
  12. Mooch

    Mooch Electron Wrangler Verified Member ECF Veteran

    Supporting member
    May 13, 2015
    That is one of the three versions of this battery. I haven't tested it but reports are that it is a 20A battery.
     
    • Like Like x 1
  13. Cloud_Generator

    Cloud_Generator Senior Member Verified Member ECF Veteran

    Jan 22, 2016
    United States
    That makes me feel better!
    Thank you!
     
    • Like Like x 1
  14. Konstantinos Kazantzoglou

    Konstantinos Kazantzoglou Full Member

    Mar 20, 2016
    Athens Greece
    • Like Like x 1
  15. Ant G

    Ant G Full Member

    Sep 21, 2015
    UK
    Personally I wouldn't go anywhere near Efest batteries, or any brand that has 'fire' in the name. I'm aware that these brands use seconds (and thirds!) from the big boys. Given that there's the potential of my face or hands being badly burnt if a battery vents, I'm sure as hell not prepared to risk that for the sake of a few quid.

    I pays my money and stick to Sony, Samsung and LG.
     
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