Efest IMR18500 1100mAh (Red)

V1 Flat top

This is the second time I test these cells and the result is the same.

DSC_1862

Official specifications:
Efest%20IMR18500%20V1%201100mAh%20(Red)%202013-info

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DSC_1863 DSC_1864

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Efest%20IMR18500%20V1%201100mAh%20(Red)%202013-Capacity

The batteries does track nicely and has nearly the same capacity at any load.

Efest%20IMR18500%20V1%201100mAh%20(Red)%202013-CapacityTimeHours

Efest%20IMR18500%20V1%201100mAh%20(Red)%202013-CapacityTime

Efest%20IMR18500%20V1%201100mAh%20(Red)%202013-Energy

Efest%20IMR18500%20V1%201100mAh%20(Red)%202013-PowerLoadTime

Efest%20IMR18500%20V1%201100mAh%20(Red)%202013-TripCurrent

The low capacity can be seen here, the battery is nearly empty before I am finished with the test.

Efest%20IMR18500%20V1%201100mAh%20(Red)%202013-Charge



V2 button top

DSC_1867

Official specifications:
Efest%20IMR18500%20V2%201100mAh%20(Red)-info

DSC_1855

DSC_1868 DSC_1869

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DSC_1872

Efest%20IMR18500%20V2%201100mAh%20(Red)-Capacity

The batteries does track nicely and has nearly the same capacity at any load. They do have slightly less capacity than the V1 above, maybe because they have a different age.

Efest%20IMR18500%20V2%201100mAh%20(Red)-CapacityTimeHours

Efest%20IMR18500%20V2%201100mAh%20(Red)-CapacityTime

Efest%20IMR18500%20V2%201100mAh%20(Red)-Energy

Efest%20IMR18500%20V2%201100mAh%20(Red)-PowerLoadTime

Efest%20IMR18500%20V2%201100mAh%20(Red)-TripCurrent

The low capacity can be seen here, the battery is nearly empty before I am finished with the test.

Efest%20IMR18500%20V2%201100mAh%20(Red)-Charge



Conclusion

These IMR batteries have very good performance at any load, but the capacity is, of course, not that high (For just 15mm more length, it is possible to get double capacity).
At the current time I can only rate them acceptable, because Efest is a new company, and the batteries is not from one of the big brands.



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