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Thread: Test/Review of Efest IMR18650 2500mAh (Purple) 2014

  1. #1
    *Flashaholic* HKJ's Avatar
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    Default Test/Review of Efest IMR18650 2500mAh (Purple) 2014

    Efest IMR18650 2500mAh (Purple) 2014



    Official specifications:
    • Capacity: 2500mAh
    • Min. Capacity: 2400mAh
    • Nominal voltage: 3,6 - 3,7V
    • Charge voltage: 4,20V ±0,05
    • Discharge voltage: 2,75V
    • Max discharge current: 35A (14C)
    • Positive pole: Flat Top
    • Protection circuit (BMS): no (unprotected)
    • Diameter: 18,40mm ± 0,1
    • Height: 65,25mm ± 0,2
    • Weight: 48g ± 1
    • Charging methode: CC-CV




    This is a very high current battery, but the 35A rating might be a bit optimistic.












    These curves shows a very good battery, there is a good tracking between the batteries and not much capacity drop from 0.2A to 20A.















    Conclusion

    Usual a battery with unspecified cell will not get better rating than acceptable, but there is no doubt this is a very good cell that is used here.



    Notes and links

    The batteries was supplied by Akkuteile.de for review.

    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
    Last edited by HKJ; 05-03-2014 at 07:25 AM.
    My website with battery, charger, usb reviews, comparisons & information: https://lygte-info.dk/
    Latest addition is multimeter reviews

  2. #2
    Flashaholic*
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    Default Re: Test/Review of Efest IMR18650 2500mAh (Purple) 2014

    Thanks for your time to do these Test/Reviews

  3. #3
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    Default Re: Test/Review of Efest IMR18650 2500mAh (Purple) 2014

    Thanks for your review excellent job as usual!


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    Default Re: Test/Review of Efest IMR18650 2500mAh (Purple) 2014

    I think it's the same cell as these ... "Samsung INR18650-25R 3.6V 2500mAh" ... both very very good...

  5. #5
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    Default Re: Test/Review of Efest IMR18650 2500mAh (Purple) 2014

    So I think it's fair to say from the various products you've tested that Efest is proving to be a trustworthy name?

  6. #6
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    Default Re: Test/Review of Efest IMR18650 2500mAh (Purple) 2014

    Quote Originally Posted by Patt View Post
    I think it's the same cell as these ... "Samsung INR18650-25R 3.6V 2500mAh" ... both very very good...
    I think under that wrapper is an lg18650he2

  7. #7
    Flashaholic* skyfire's Avatar
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    Default Re: Test/Review of Efest IMR18650 2500mAh (Purple) 2014

    thank you HKJ for another great review!

  8. #8

    Default Re: Test/Review of Efest IMR18650 2500mAh (Purple) 2014

    Thank you for the review.
    Will it be ok to my Olight M22 ,or there are better options ? Let's say I want only IMRs.

  9. #9
    *Flashaholic* HKJ's Avatar
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    Default Re: Test/Review of Efest IMR18650 2500mAh (Purple) 2014

    Quote Originally Posted by G.Brooks View Post
    Will it be ok to my Olight M22 ,or there are better options ? Let's say I want only IMRs.
    Panasonic has some 2900mAh

    Neither of the batteries are old style IMR chemistry, but uses more modern chemistry to get the higher capacity.
    My website with battery, charger, usb reviews, comparisons & information: https://lygte-info.dk/
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    Flashaholic Tacitus's Avatar
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    Default Re: Test/Review of Efest IMR18650 2500mAh (Purple) 2014

    Thanks HKJ for the very helpful information!

  11. #11
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    Buttrock Re: Test/Review of Efest IMR18650 2500mAh (Purple) 2014

    Quote Originally Posted by HKJ View Post
    Panasonic has some 2900mAh

    Neither of the batteries are old style IMR chemistry, but uses more modern chemistry to get the higher capacity.

    @ HKJ,
    what makes you say this? what is the difference between the old style and the new?
    what i am thinking is the tendency for manufacturers to use Nickle in their cells to help with capacity - is this what you mean?

    PS - cheers for all your awesome effort in testing, you rock

  12. #12
    Flashaholic* RI Chevy's Avatar
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    Default Re: Test/Review of Efest IMR18650 2500mAh (Purple) 2014

    Welcome to the Forum!

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