Test/Review of Efest IMR26650 3500mAh (Purple) 2014

Efest IMR26650 3500mAh (Purple) 2014



Official specifications:

  • Typical capacity: 3500,Ah
  • Maximum discharge current: 32A
  • Maximum pulse discharge current: 64A
  • Maximum charge current: 6.5A
  • Resistance: 13mOhm +/-2mOhm
  • Nominal voltage: 3.8 volt
  • Discharge cut-off voltage: 2.5 volt
  • Full charge voltage: 4.2 volt
  • Temperature range: -20°C ~ 60°C
  • Temperature range discharge: -20°C ~ 60°C
  • Temperature range charge: 0°C ~ 45°C
  • Monthly self-discharge rage: <=0.5%




A high current 26650 batteries, this time Efest has printed both the pulse and the continuous rating on the battery.










The discharge curves is tracking nicely and capacity is nearly constant up to 20A and do also match the marked capacity. The 30A curve is a bit high for the battery.















Conclusion

It looks like this battery follows the Efest style for the purple batteries with very good high current performance. The price for this high current performance is less capacity.



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

That is indeed a high current cell which deserves its name. Thanks for the review.

Wow, the high voltage at high drain is amazing on this cell - it blows everything else away. :open_mouth:

Thanks.

Awesome review…man it sure did hold tough at those high current drain levels

Thanks!!!

Again, awesome! I've only got these recently and have been very impressed. For my DD light mods, they did as well as the Efest 35A, Sam 25R, LG HE2, SONY VTC5, so thought it would show well in your tests. Though the capacity is low by today's standards for 26650's, it's the SONY 26650 equal (or better) and much higher capacity.

Thanks HKJ.

Thank you for the awesome review (as always) HKJ.

I'm really surprised to see how much better these hold their volts with high amps, relative to the Keeppower IMR26650 3500mah's. Could these be different cells than the Keeppowers?

Wow these look like the new high discharge king! Will you be testing the green Efest 4200mahs also?

Comparing the 20A curve I believe they are different cells.

I have no plans for that at the current time, but maybe Efest will send some batteries to me (They do that sometimes).

I do still have a few Efest batteries in queue from the last batch I received. At that time I had a very long queue:

I have tested most of it now.