Efest Metallic Purple 20A 3000mAh 18650 Bench Test Results...accurately rated 20A, looks like 30Q

Discussion in 'Batteries and Chargers' started by Mooch, Jun 19, 2016.

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  1. Mooch

    Mooch Electron Wrangler Verified Member ECF Veteran

    Supporting member
    May 13, 2015
    These cells were donated for the purposes of testing by Efest. Thank you! 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


    Bottom Line
    This new Efest is accurately rated at 20A and 3000mAh. Its appearance is almost identical to the Samsung 30Q but it performs a bit better. This Efest still has the useless 35A "pulse" rating in large lettering on the wrap but does list both the continuous and pulse ratings, a welcome change for Efest. These new metallic wrap 18650's ship with a plastic battery case for each pair of batteries.


    Continuous-Current Test Results
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    Pulsed-Current Test Results
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    Comments
    • At 10A continuous it reached about 2800mAh. This is average performance for a 3000mAh cell at 10A so I am rating this cell at 3000mAh.
    • At 15A continuous the temperature rose to 67°C. This is below the average temperature of a cell running at its continuous discharge rating (CDR).
    • At 20A continuous the temperature rose to 81°C. This is a bit above, but close to, the temperature of a cell running at its CDR and is an indication that this is the cell's true rating.
    • At 25A continuous the temperature rose to 95°C. This is way above the average temperature of a cell running at its CDR and is an indication that we're above the cell's true rating.
    • I am setting a CDR of 20A for this cell. Operating at that level would bring the temperature up to just above the average for a cell operating at its CDR. 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 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
     
  2. Spirometry

    Spirometry Super Member Verified Member ECF Veteran

    Oct 13, 2014
    New Orleans
    Congratulations Mooch.
    I believe it is your constant testing and educating others that most likely put a dent in Efest sales. Forcing Efest to make some changes.

    The name "Mooch" has turned into quite a phenomenon. You can't find a youtube reviewer that hasn't mentioned your name. This in turn has created a trickle down effect. Even companies selling batteries are spreading the word. I found this over on the Illunm site.
    *Manufacturer reported specifications
    NOTE: Efest has been known to overestimate battery ability. Refer to known battery testers like MOOCH for information about these specific batteries

    With any luck, we hope Efest doesn't pull some of their other known business practices and do the ever so popular switcheroo.
     
  3. Mooch

    Mooch Electron Wrangler Verified Member ECF Veteran

    Supporting member
    May 13, 2015
    That's my concern too. I will be retesting the metallic 18650's later this year to find out.
     
  4. USACelt

    USACelt Senior Member Verified Member ECF Veteran

    Feb 17, 2015
    Desert Southwest
    If E-fest is correcting the performance and outright fabrications of their cells, They might see Me shadow their doorstep again. But I will wait till the next test to even think about it.:hubba:
     
    Mooch likes this.
  5. supertrunker

    supertrunker Living sarcasm Verified Member ECF Veteran

    Supporting member
    Oct 12, 2012
    Texas
    Why would you buy from anyone that has been caught lying about the abilities of their products?

    There are more honest vendors out there and battery safety, especially with the vaping world under a microscope just now, is the highest priority.
    i don't trust to luck with these things. Nor should anyone.

    T
     
  6. sonicbomb

    sonicbomb Vaping Master Verified Member ECF Veteran

    Feb 17, 2015
    1187 Hunterwasser
    I support your testing of Efest's cells, but I honestly can't understand why someone would choose a rewrap over an original Sony Samsung or LG.
     
    Matty316, DarrellG, DaveP and 3 others like this.
  7. Assi

    Assi Multiple ID Suspension

    Jun 2, 2016
    There will be only 3 reasonable Arguments for me to prefer a rewrap battery on OEM:

    1. There are many fakes of genuine OEM batteries on the market and on some local market places in China you can buy "genuine" Samsung, LG and Sony shrinks.

    2. Many Dealers sell old batteries. There are many left-overs of old batteries on the market, that just Change Hands. These are not fakes and not B, C, D, or Z -grade batteries...they are just old and very often were stored inappropriate.

    3. Although my eVic Mini is great, and eventhough I was very careful...the battery got a crack from a sharp edge of the device. A good PVC Shrink (like in flashlight batteries with protection) would hold that, but not the very thin industrial "Skin"
     
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  8. m1ke

    m1ke Senior Member ECF Veteran

    Feb 18, 2013
    East Coast, USA
    So.. One of these will be here tomorrow (Efest IMR 18650 LiMn 3000mAh Battery - Flat Top - 20 Amp) and will go inside a PICO..

    I'm expecting a battery capable of a continuous 20a, buuuut.. I guess I can't expect that?

    I'll only be asking 9-10a from it (0.5 ohm coil @ around 42 watts).
     
    DaveP likes this.
  9. Mooch

    Mooch Electron Wrangler Verified Member ECF Veteran

    Supporting member
    May 13, 2015
    As long as it's not the 10A version that was around a few months ago it should be a 20A battery, either the HG2 or 30Q.
     
  10. m1ke

    m1ke Senior Member ECF Veteran

    Feb 18, 2013
    East Coast, USA
    Right, but is there anyway to confirm what version it is?

    Or am I just gonna have to use it and see how warm it gets? I mean, if it's a 10a rated battery and I pull 9a from it, I'm guessing it'll run much hotter than a battery that's rated for 20a.

    I don't think I'll be buying anymore Efest batteries after this one just because of the uncertainty. This is my first 18650 I've bought.
     
  11. Mooch

    Mooch Electron Wrangler Verified Member ECF Veteran

    Supporting member
    May 13, 2015
    Good idea.:)
    There is a way to identify the 10A version as its 3-prong top contact is smaller than the 20A version. Here's more info...

    WARNING: Efest Purple 35A 3000mAh is now a 10A battery!

    If your Efests have 4-prong top caps then they are the 20A versions....or, they were. You never know for sure with these rewrapped brands.
     
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  12. m1ke

    m1ke Senior Member ECF Veteran

    Feb 18, 2013
    East Coast, USA
    So.. what's your opinion on this one? The authentication was confirmed, but what does that really mean with an efest..

    I'll be adding pics in a minute.......
     
  13. m1ke

    m1ke Senior Member ECF Veteran

    Feb 18, 2013
    East Coast, USA
  14. m1ke

    m1ke Senior Member ECF Veteran

    Feb 18, 2013
    East Coast, USA
    It came with a plastic case for two cells, the wrapper looks the same, and the top cap too, so it looks like I got one like you tested. I got this from myvaporstore.com FYI. They seem to be a proper company.

    I guess eFest had to step up their practices since you started exposing the true continuous discharge rates of their previous cells.

    Still, I'm not gonna buy anymore of their cells.
     
  15. Mooch

    Mooch Electron Wrangler Verified Member ECF Veteran

    Supporting member
    May 13, 2015
    The authentication is useless and would only tell you it's a genuine 10A Efest.

    That battery you show pictures of is the newer one with a completely different wrap. I am only aware of it existing as a 20A battery.
     
    m1ke likes this.
  16. m1ke

    m1ke Senior Member ECF Veteran

    Feb 18, 2013
    East Coast, USA
    Mooch, does the number on the negative end of the battery mean anything specific? H11 is on mine. H9 is on the one you tested.

    Nevermind. I just found the exact battery and you tested it! This Efest I have is a re-wrapped Samsung 25R Blue Wrap 20A 2500mAh.

    [​IMG]
    [​IMG]
     

    Attached Files:

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  17. DaveP

    DaveP PV Master & Musician ECF Veteran

    Supporting member
    May 22, 2010
    Central GA
    I only own a couple of Efest purple 18650's. Both have performed well over 2 or 3 years, but I seldom use either as long as I have newer ones charged and ready. Both are highly overrated on the heat shrink label, but they perform about as well as any of my other batteries for approximate hours of 10W vaping time.

    I ordered my first pair of Sony VTC6's this morning. I'm looking forward to a little more vape time compared to the HG LG2's and Samsung 25R's (which have both been good cells for a year and a half).
     
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