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

[HKJ]

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

[blackbalsam]

Thanks for your time to do these Test/Reviews

[TEEJ]

Thanks for your review excellent job as usual!

[Patt]

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

[RoGuE_StreaK]

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

[vicv]

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

[skyfire]

thank you HKJ for another great review!

[G.Brooks]

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.

[HKJ]

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.

[Tacitus]

Thanks HKJ for the very helpful information!

[uniformsierra]

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

[RI Chevy]

Welcome to the Forum!