Imren Leopard 50A 2600mAh 18650 Bench Test Results...just a 20A rewrap

Discussion in 'Batteries and Chargers' started by Mooch, Apr 17, 2016.

Thread Status:
Not open for further replies.
Image has been removed.
URL has been removed.
Email address has been removed.
Media has been removed.
  1. Mooch

    Mooch Electron Wrangler Verified Member ECF Veteran

    Supporting member
    May 13, 2015
    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.


    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 continuously.

    image.jpeg image.jpeg image.jpeg image.jpeg


    Bottom Line
    This Imren is a rewrap with a ridiculously exaggerated current rating. It is identical in performance and appearance to the 20A 2600mAh Sony VTC5. At 27A continuous this cell gets hot enough to boil water. At its 50A rating down to 3.2V it only delivers about 15mAh (fifteen). I am giving this cell a 20A 2600mAh rating but Imren can change what cell they use at any time without telling us.

    These cells were donated for the purpose of testing by the Vapor Emporium (The Vapor Emporium).


    Continuous-Current Test Results (with VTC5 comparison)
    image.png


    Pulsed-Current Test Results
    I'm not wasting the time needed to pulse test this obvious rewrap. See my VTC5 pulse discharge tests to see how well this cell would perform when pulsed, unless Imren changes what cell is under the wrap.

    Sony VTC5 2500mAh 18650 Retest Results...a great 20A 2600mAh battery


    Comments
    • At 10A continuous it reached about 2500mAh. This is very good performance for a 2600mAh-rated cell operating at 10A so I am rating this cell at 2600mAh.
    • At 15A continuous the temperature rose to 71°C. This is a few degrees below the average temperature for a cell operating at its continuous discharge rating (CDR).
    • At 20A continuous the temperature rose to 81°C. This is just a couple degrees above the average temperature for a cell operating at its CDR, an indication that we're operating at its true rating.
    • At 25A continuous the temperature rose to 96°C. This is a significantly above the average temperature for a cell operating at its CDR.
    • At 30A continuous the temperature rose to 109°C. This is way, way above the average temperature for a cell operating at its CDR and is above my 100°C safety cutoff. The voltage is low and sagging a lot.
    • At 35A continuous the temperature rose to 119°C. This is a preposterously high temperature for a cell to operate at. The voltage is uselessly low.
    • Discharges were done at 40A and 45A continuous, showing the voltage plunging quickly to the 2.8V cutoff.
    • A discharge at 50A was done, the cell's rating, and the voltage instantly dropped to below 3.3V. The cell only supplied about 15mAh before dropping to 3.2V. This is clearly not a 50A cell.
    • I am setting a CDR of 20A for this cell. Its temperature is the same as the Sony VTC5 operating at its CDR and at the time of my testing its appearance and performance are the same as a VTC5. 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.
    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. B2L

    B2L Vaping Master Verified Member ECF Veteran

    Supporting member
    Jan 14, 2012
    Jacksonville, FL
    Not only can they apparently not learn, they get bolder :yawn:

    (By bolder I mean even more stupid :grr: )
     
  3. f1vefour

    f1vefour Vaping Master ECF Veteran

    Dec 3, 2013
    Pensacola
    But it has that leopard wrap, increases cloudz by 10x bruh.
     
  4. sonicbomb

    sonicbomb Vaping Master Verified Member ECF Veteran

    Feb 17, 2015
    1187 Hunterwasser
    50 amps? Jeeze that's terrifying.
    Scumbags.
     
  5. f1vefour

    f1vefour Vaping Master ECF Veteran

    Dec 3, 2013
    Pensacola
    How can they not understand doing things like this make them sell less batteries, they need to fire someone.
     
  6. KenD

    KenD Vaping Master ECF Veteran

    Aug 20, 2013
    Stockholm, Sweden
    I don't think it'll make them sell less batteries, unfortunately. Vapers who know about the problems with rewrapps are a minority, and that also includes a seemingly large number of vapers who've heard of the problems but refuse to admit it.

    Sent from my M7_PLUS using Tapatalk
     
    Topwater Elvis and Mooch like this.
  7. f1vefour

    f1vefour Vaping Master ECF Veteran

    Dec 3, 2013
    Pensacola
    I don't know how many follow Mooch's testing but I know it's a lot, of course this is primarily English speaking folk.

    In the large scale you are likely right, but battery awareness is getting better.

    I know how some are and it shows how stupid they can be.

    This is what we often see:

    "I know these are 20A batteries but I haven't had any problems running them at 30A"

    It's like they don't care about the safety of themselves or those in close proximity. Fortunately most vapers are using IMR or hybrid batteries, I'm thankful ICR has been pushed aside in the past few years.
     
    KenD likes this.
  8. KenD

    KenD Vaping Master ECF Veteran

    Aug 20, 2013
    Stockholm, Sweden
    Yes, things are slowly but surely moving in the right direction. Still, very few of the popular reviewers dare (or care) to speak up about the inflated specs of rewraps (I'm looking at you Pbusardo).

    And yeah, the "it has worked find for me"-crowd really bugs me. The last time I tried to educate on the matter was in the Smok G3 thread. Finally I simply had to give up.

    Sent from my M7_PLUS using Tapatalk
     
    f1vefour likes this.
  9. Mooch

    Mooch Electron Wrangler Verified Member ECF Veteran

    Supporting member
    May 13, 2015
    That will be changing soon. :)
     
    B2L, f1vefour and KenD like this.
  10. KenD

    KenD Vaping Master ECF Veteran

    Aug 20, 2013
    Stockholm, Sweden
    It's about time :)

    Sent from my M7_PLUS using Tapatalk
     
  11. f1vefour

    f1vefour Vaping Master ECF Veteran

    Dec 3, 2013
    Pensacola
    Reviewers generally don't want to comment on batteries due to liability issues I'm guessing.

    They say what is good then you use the batteries and they vent, next thing they know is a .... storm of drama.

    I know PoH and Phil follow Mooch's (Mooches?) battery testing, likely all reviewers do but simply aren't mentioning it. Once Phil begins commenting others will follow suit.
     
  12. Clark Kent

    Clark Kent Super Member ECF Veteran

    Jun 25, 2014
    Metropolis Il.
    I seen these a while back and nearly fell out of my chair laughing at the bold claims that this battery stated. I said right then and there I bet this is no more than a 20A CDR battery tops. Thanks for testing Mooch.
     
    Mooch likes this.
  13. FishingBuffalo

    FishingBuffalo Senior Member ECF Veteran

    Mar 22, 2012
    Collinsville,TX
    Maybe Imren is kinda truthful at their claim of 50 amps. Look at the wrap. They may be saying careful the leopards have been known to bite, and bite hard. I wish these companies would stop this over marketing on unsuspecting folks.
     
  14. sonicbomb

    sonicbomb Vaping Master Verified Member ECF Veteran

    Feb 17, 2015
    1187 Hunterwasser
    I'm realizing the market is literally awash with cells like this. It's really concerning.
     
  15. WheelieMasterGoku

    WheelieMasterGoku New Member

    May 25, 2016
    So, question!
    I have 3 of these so-called "50A MAX/ 30A" Imren Cheetah turds in my RX200 Reulaux.

    I was under the impression these were true 50amp pulse batteries. Currently have a 25mm Erebus Kaos RTA with 2 5 wrap claptons pushing about 0.22Ω.
    What wattage/voltage can SAFELY run this at? I get the series/parallel crap so I know the mod runs in series with 3 cells, but since these arent a true 50A battery, whats the pulse rating? What can I run these at? Id love to know.

    The ramp up is a ..... under 90 watts but I don't want to waste the build I have in there as it performs well and I like it very much. Any answers would be appreciated. Im still trying to leanr all this ..... Only a few months it.

    Ohms law calculator said .22 @ 80 watts equals 4.19 volts and around 19A. Obviously not taking into consideration voltage drop, etc... So what would you guys recommend I run this at, since he didn't do a pulse rating test on these.

    This are what the local shop had on hand. Just notified my buddy who works there that these are rewraps.
     
  16. sonicbomb

    sonicbomb Vaping Master Verified Member ECF Veteran

    Feb 17, 2015
    1187 Hunterwasser
    On a regulated device the coil resistance is unimportant, only the wattage is relevant in terms of the amp draw from the batteries.
    So 80W on your RX200 is 7 amps per battery at full charge and 9.3 amps discharged.
    If you want to be safe, then adhere to the known CDR of the cells you are using. This is the amperage that the cell can provide continuously. Drawing amp levels above the CDR is ill-advised for a number of reasons. Think of it like red lining the revs on an engine, you are going to damage your engine and sooner or later you are going to throw a conrod.

    Calculating battery current draw for a regulated mod | E-Cigarette Forum
     
    KenD and Mooch like this.
  17. WheelieMasterGoku

    WheelieMasterGoku New Member

    May 25, 2016
    So 80 in a sense is well under what I could run this at? Why is it 7 amps per battery if it runs in a series configuration?
    But yeah, I gotcha! Or a spun bearing! Totally get the consequences.
     
  18. Mooch

    Mooch Electron Wrangler Verified Member ECF Veteran

    Supporting member
    May 13, 2015
    The Imren Leopard tested out as a 20A VTC5 rewrap...for now. This can change at any time.
     
    KenD likes this.
Thread Status:
Not open for further replies.

Share This Page