Efest IMR18650 2100mAh (Purple) 2017

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Official specifications:
Efest%20IMR18650%202100mAh%20(Purple)%202017-info

A high current cell with fairly low capacity.

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Efest%20IMR18650%202100mAh%20(Purple)%202017-Capacity

The discharge curves looks very good with tracking and about constant capacity up to 20A.

Efest%20IMR18650%202100mAh%20(Purple)%202017-Temp-15.0

Efest%20IMR18650%202100mAh%20(Purple)%202017-Temp-20.0

Efest%20IMR18650%202100mAh%20(Purple)%202017-Temp-30.0

The cell gets hot at 30A, but not too hot.
I have a suspicion that I did not mount the temperature sensor for the B cell correctly.

Efest%20IMR18650%202100mAh%20(Purple)%202017-CapacityTimeHours

Efest%20IMR18650%202100mAh%20(Purple)%202017-CapacityTime

Efest%20IMR18650%202100mAh%20(Purple)%202017-Energy

Efest%20IMR18650%202100mAh%20(Purple)%202017-PowerLoadTime

Efest%20IMR18650%202100mAh%20(Purple)%202017-TripCurrent

Efest%20IMR18650%202100mAh%20(Purple)%202017-Charge



Conclusion

The test shows a good quality cell that can deliver lot of current, but the capacity is not very high by todays standard.



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