Efest IMR18500 V1 1100mAh (Red)

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

This battery is a IMR 18500, i.e. it is shorter than the usual 18650 batteries! It does also have less capacity.

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

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

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

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

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

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

Efest%20IMR18500%20V1%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%20V1%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