Test/review of Efest IMR18500 1000mAh (Purple) 2017

HKJ · Jul 28, 2017

Efest IMR18500 1000mAh (Purple) 2017

Official specifications:

Capacity: 1000mAh
Voltage: 3.7V
Continuous discharge current: 10A
Pulse discharge current: 15A
Diameter: 18.50 (+/-0.2)mm
Length: 50.20 (+/-0.2)mm

Efest%20IMR18500%201000mAh%20(Purple)%202017-info.png

A high current 18500 cell.

Efest%20IMR18500%201000mAh%20(Purple)%202017-Capacity.png

This is very nice discharge curves with good tracking and the cell can deliver 15A.

Efest%20IMR18500%201000mAh%20(Purple)%202017-Temp-7.0.png

Efest%20IMR18500%201000mAh%20(Purple)%202017-Temp-10.0.png

Efest%20IMR18500%201000mAh%20(Purple)%202017-Temp-15.0.png

Efest%20IMR18500%201000mAh%20(Purple)%202017-CapacityTimeHours.png

Efest%20IMR18500%201000mAh%20(Purple)%202017-CapacityTime.png

Efest%20IMR18500%201000mAh%20(Purple)%202017-Energy.png

Efest%20IMR18500%201000mAh%20(Purple)%202017-PowerLoadTime.png

Efest%20IMR18500%201000mAh%20(Purple)%202017-TripCurrent.png

Efest%20IMR18500%201000mAh%20(Purple)%202017-Charge.png

I did mostly run the cell empty during this test, it can deliver a lot of current, but not for long.

Conclusion

Good high current performance, capacity as expected in a high current cell.
This is a good cell.

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

markr6 · Jul 28, 2017

Good cell. I'm just trying to figure out what's going on with the packaging graphics!

HKJ said:

HKJ · Jul 28, 2017

markr6 said:
Good cell. I'm just trying to figure out what's going on with the packaging graphics!

Efest and their man, sometimes their graphics is funny, sometimes not. I must admit that I like their idea about trying to make a funny graphic on each product, but at the same time I am a bit cynic. Check my charger reviews in the near future, each box has a comic on the back. Can you keep your toes straight?

maukka · Jul 28, 2017

I'd like an 18500 that closes the gap between the 18350 Aspire 1100mAh and a good 18650. There doesn't seem to be one yet.

HKJ · Jul 28, 2017

maukka said:
I'd like an 18500 that closes the gap between the 18350 Aspire 1100mAh and a good 18650. There doesn't seem to be one yet.

No and when one show up (in my testing) I will rate this type of battery a bit lower. But until that time this is about the best you can get.

And in case some is wondering, I cannot evaluate batteries depending on what is possible, only on what I receive. The first one to send my a 18500 battery with the same chemistry as the Aspire 18350 will probably get a very good review, any 18500 after that will only get a very good evaluation if they can match the performance.

Test/review of Efest IMR18500 1000mAh (Purple) 2017

HKJ

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markr6

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HKJ

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maukka

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HKJ

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