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

Efest IMR18650 2500mAh (Purple) BT 2014



Official specifications:

  • Weight: 50g
  • Size: 65.69mm(L)x18.30mm(D)
  • Top: Button top
  • Bottom: unprotected
  • Typical Capacity: 2500mAh
  • Discharge temperature range: -20°C—60°C
  • Charge temperature range: 0°C—45°C
  • Storage: 1 year: -20°C—25°C, 3 months: -20°C—45°C, 1 month: -20°C—60°C




Efest high current 18650 in button top version, again with the optimistic 35A rating.










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

The button top will add a very small resistance and reduce the performance slightly at very high currents.
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 Efest 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
Compare to 18650 and other batteries

Awesome review as usual!!!

Would you say there is only very minor or almost nil performance difference compare to the flat top version?

If you want to use it for really low sub-ohmic vaping, I would go for the flat top version.

But below 15A the difference is insignificant.

Thank you so much!
I wonder why there aren’t more people saying thank you… I guess it’s because it spreads out on your (many) posts.
Thanks!

you are right lagman…

THX HKJ for your great - never restless work !

Truly appreciate your contributions here HKJ

Most all of us here are ALWAYS appreciative of Henrik’s work. :beer:
It is always top notch, unbiased, and done with a high degree of professionalism and integrity. :beer:

Your reviews helped me greatly in selecting chargers and batteries.
Thanks!

Thanks you (again and again) HKJ.

I have to say thank you too. Your wonderful reviews did help me on deciding which charger and batteries to buy.

Thanks. I have the flat top version in my best light. Nice to know it works well.

This 18650 seems to track just under the LG HE2 and Samsung 25R, so I could see them using cells from one of those series.

I rate this member as a cornerstone of BLF :wink:

I do appreciate a thank you, but a long list each time I post a review is way to much.

Thank you so much HKJ, your reviews help shed some light (pun intended) on this complicated and crowded market today.