Efest IMR18650 2000mAh (red)
V1 Flat top

DSC_1005

Official specifications:
Efest%20IMR18650%20V1%202000mAh%20(red)-info

Internal resistance is calculated between 4A and 5A

DSC_0790

DSC_1006 DSC_1007

DSC_1008
DSC_1009

Efest%20IMR18650%20V1%202000mAh%20(red)-Capacity

Acceptable performance up to 7A, but they have problems with 10A.

Efest%20IMR18650%20V1%202000mAh%20(red)-CapacityTimeHours

Efest%20IMR18650%20V1%202000mAh%20(red)-CapacityTime

Efest%20IMR18650%20V1%202000mAh%20(red)-Energy

Efest%20IMR18650%20V1%202000mAh%20(red)-PowerLoadTime

Efest%20IMR18650%20V1%202000mAh%20(red)-TripCurrent

Efest%20IMR18650%20V1%202000mAh%20(red)-Charge



V2 Button top

DSC_1000

Official specifications:
Efest%20IMR18650%20V2%202000mAh%20(red)-info

Internal resistance is calculated between 4A and 5A

DSC_0790

DSC_1001 DSC_1002

DSC_1003
DSC_1004

Efest%20IMR18650%20V2%202000mAh%20(red)-Capacity

Acceptable performance up to 5A, but they have problems with 7A and 10A.

Efest%20IMR18650%20V2%202000mAh%20(red)-CapacityTimeHours

Efest%20IMR18650%20V2%202000mAh%20(red)-CapacityTime

Efest%20IMR18650%20V2%202000mAh%20(red)-Energy

Efest%20IMR18650%20V2%202000mAh%20(red)-PowerLoadTime

Efest%20IMR18650%20V2%202000mAh%20(red)-TripCurrent

Efest%20IMR18650%20V2%202000mAh%20(red)-Charge



Conclusion

These batteries are supposed to be IMR cells, but their performance it not good at high currents.
At 5A and below they do have an acceptable performance.



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