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Thread: Test/Review of Efest IMR18650 3000mAh (Purple) 2016

  1. #1
    *Flashaholic* HKJ's Avatar
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    Default Test/Review of Efest IMR18650 3000mAh (Purple) 2016

    Efest IMR18650 3000mAh (Purple) 2016



    Official specifications:
    • Rated capacity: 3000mAh
    • Nominal voltage: 3.7V
    • Max charging current: 4A
    • Standard charge: 2A
    • Max continuous discharge current: 35A
    • Pulse discharge current: 60A
    • Charging temperature range: 0C ~ 45C
    • Discharging temperature range: -20C ~ 75C
    • Inner resistance: 20mOhm
    • Cell size: 18.5mm x 65.20mm




    High capacity and high current cell.











    The cell is very good up to 20A, but at 30A I terminate the test due to temperature. The tracking between the cells shows that they are very well matched.



    Temperature raise at 15A load, to get the real cell temperature add (about) 25C to the temperature.





    I had to stop here, my rig melts at this temperature (I hope to improve this).
    This is also the maximum discharge temperature for the battery.















    Conclusion

    The battery has very good performance, 20A is no problem, at 30A it is probably best not to use continious discharge.



    Notes and links

    Improvements to test stations
    How is the test done and how to read the charts
    How is a protected LiIon battery constructed
    More about button top and flat top batteries
    Compare to 18650 and other batteries
    My website with battery, charger, usb reviews, comparisons & information: https://lygte-info.dk/
    Latest addition is multimeter reviews

  2. #2

    Default Re: Test/Review of Efest IMR18650 3000mAh (Purple) 2016

    Thanks for the test/review! I am just about to purchase some 18650`s, this helps alot.

  3. #3

    Default Re: Test/Review of Efest IMR18650 3000mAh (Purple) 2016

    Battery reviews like yours are a big plus in my book,and others i am sure. I wish i would joined this forum a long time ago then i would not have wasted so much money on ,"cheap" 18650's. If i remember they were Trustfire's maybe. They didnt hold a charge long,then soon after they would not charge at all.

  4. #4
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    Default Re: Test/Review of Efest IMR18650 3000mAh (Purple) 2016

    Thanks HKJ, great review as usual. Any plans to do a review of the larger sister the Efest 3500mah(purple) 20amp? Thanks

  5. #5
    *Flashaholic* HKJ's Avatar
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    Default Re: Test/Review of Efest IMR18650 3000mAh (Purple) 2016

    Quote Originally Posted by Tachead View Post
    Any plans to do a review of the larger sister the Efest 3500mah(purple) 20amp? Thanks
    Yes
    My website with battery, charger, usb reviews, comparisons & information: https://lygte-info.dk/
    Latest addition is multimeter reviews

  6. #6
    Flashaholic* candle lamp's Avatar
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    Default Re: Test/Review of Efest IMR18650 3000mAh (Purple) 2016

    Thanks for your excellent review. HKJ!

    Discharging temperature range (-20C ~ 75C) is the internal temperature of the cell?

  7. #7
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    Default Re: Test/Review of Efest IMR18650 3000mAh (Purple) 2016

    Quote Originally Posted by 186kmps View Post
    Thanks for the test/review! I am just about to purchase some 18650`s, this helps alot.
    Buying this specific Efest battery is a little risky, as there are 3 different cells being used under the same wrapper.
    https://www.e-cigarette-forum.com/fo...#post-17083826

  8. #8
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    Default Re: Test/Review of Efest IMR18650 3000mAh (Purple) 2016

    Quote Originally Posted by HKJ View Post
    Yes

    Thanks, cant wait

  9. #9
    *Flashaholic* HKJ's Avatar
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    Default Re: Test/Review of Efest IMR18650 3000mAh (Purple) 2016

    Quote Originally Posted by Tachead View Post
    Thanks, cant wait
    My testing is a bit slow at the moment, due to my updated test stations, they melts. I do have a plan to fix it.
    My website with battery, charger, usb reviews, comparisons & information: https://lygte-info.dk/
    Latest addition is multimeter reviews

  10. #10
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    Default Re: Test/Review of Efest IMR18650 3000mAh (Purple) 2016

    Quote Originally Posted by HKJ View Post
    My testing is a bit slow at the moment, due to my updated test stations, they melts. I do have a plan to fix it.
    No problem, whenever you get to it. Hope you get your rig fixed man and thanks again

  11. #11
    Enlightened teckul's Avatar
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    Default Re: Test/Review of Efest IMR18650 3000mAh (Purple) 2016

    Quote Originally Posted by SubLGT View Post
    Buying this specific Efest battery is a little risky, as there are 3 different cells being used under the same wrapper.
    https://www.e-cigarette-forum.com/fo...#post-17083826
    Should Efest best be avoided totally if they are wrapping different cells all the time?

    I (wrongly?) thought they were an 'ok make'...
    teckul (UK)

    [[yes I'm guilty of owning too many flashlights...]]

  12. #12
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    Default Re: Test/Review of Efest IMR18650 3000mAh (Purple) 2016

    Efest is OK for a single-battery flashlight. For a multi cell flashlight I would avoid them, because of the potential for mismatches.

  13. #13
    Flashaholic* MAD777's Avatar
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    Default Re: Test/Review of Efest IMR18650 3000mAh (Purple) 2016

    I don't know what we would do without your tests!
    Can you estimate how much improved the graphs look due solely to your upgraded equipment?

  14. #14

    Default Re: Test/Review of Efest IMR18650 3000mAh (Purple) 2016

    This is why I love cpf, thanks all for the detailed info.

  15. #15
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    Default Re: Test/Review of Efest IMR18650 3000mAh (Purple) 2016

    Does anyone know if this is a true IMR or a hybrid?

  16. #16
    *Flashaholic* HKJ's Avatar
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    Default Re: Test/Review of Efest IMR18650 3000mAh (Purple) 2016

    Quote Originally Posted by Strintguy View Post
    Does anyone know if this is a true IMR or a hybrid?
    I doubt you will find a true IMR with more than 2000mAh, everything with more capacity has other elements added to the chemistry.
    My website with battery, charger, usb reviews, comparisons & information: https://lygte-info.dk/
    Latest addition is multimeter reviews

  17. #17

    Default Re: Test/Review of Efest IMR18650 3000mAh (Purple) 2016

    Is this the same type battery that exploded in the guy's pocket?

  18. #18

    Default Re: Test/Review of Efest IMR18650 3000mAh (Purple) 2016

    This is the samsung 30Q

    I am cycle testing on here:
    https://endless-sphere.com/forums/vi...8556&start=125

    Samsung rates it 15A continuous max.

    It's NCA.

  19. #19

    Default Re: Test/Review of Efest IMR18650 3000mAh (Purple) 2016

    I have few of this batteries now 3000mAH 35A and it is perform well so far.

  20. #20

    Default Re: Test/Review of Efest IMR18650 3000mAh (Purple) 2016

    Since the 3500 mAh version varies greatly in performance I would be hesitant to even try this.

  21. #21
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    Default Re: Test/Review of Efest IMR18650 3000mAh (Purple) 2016

    Quote Originally Posted by recDNA View Post
    Since the 3500 mAh version varies greatly in performance I would be hesitant to even try this.
    If you are lucky (usually first batch only for testing purpose and reviews) you will get lg mj1 under that wrapper.
    Later on Efest use whatever they find for cheap and rewrap.
    Difference in performance because those are 2 completely different cells under that wrapper.
    35A (there is no 35A cell in existence) battery is Samsung 25R or LG he2 again if you are lucky.

  22. #22
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    Default Re: Test/Review of Efest IMR18650 3000mAh (Purple) 2016

    Quote Originally Posted by stjong View Post
    I have few of this batteries now 3000mAH 35A and it is perform well so far.
    35A (there is no 35A cell in existence) battery is Samsung 30q or LG hg2 again if you are lucky.
    It is just a marketing (very dangerous) move to get vapers to buy.
    Vaping community = almost non existent battery knowledge

    Quote Originally Posted by recDNA View Post
    Since the 3500 mAh version varies greatly in performance I would be hesitant to even try this.
    Difference in performance because those are 2 completely different cells under that wrapper.
    If you are lucky (usually first batch only for testing purpose and reviews) you will get lg mj1 under that wrapper.
    HKJ received I think one lg mh1 (much cheaper cell far from 3500mAh) and another is different cell (if I see picture of the other one I can identify it)

  23. #23

    Default Re: Test/Review of Efest IMR18650 3000mAh (Purple) 2016

    My point exactly. Batteries should NOT be like a box of chocolates. Just no way to check under the hood before buying. I wish Samsung would produce consumer batteries. I guess the liability would be too great.

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