Efest 16340 850mAh (Black) 2014

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Official specifications:
Efest%2016340%20850mAh%20(Black)%202014-info

The capacity is specified way to high as it usual is with 16340 batteries.

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Efest%2016340%20850mAh%20(Black)%202014-Capacity

The battery has a very stable capacity, independently of load. This is much better than last time I tested this battery.

Efest%2016340%20850mAh%20(Black)%202014-CapacityTimeHours

Efest%2016340%20850mAh%20(Black)%202014-CapacityTime

Efest%2016340%20850mAh%20(Black)%202014-Energy

Efest%2016340%20850mAh%20(Black)%202014-PowerLoadTime

Efest%2016340%20850mAh%20(Black)%202014-TripCurrent

Efest%2016340%20850mAh%20(Black)%202014-Charge



Conclusion

The battery does not have the highest capacity of 16340 batteries, but it does a good job in the 1A to 2A range, making it a good fit for many flashlights.
I will rate the battery as acceptable.


Notes and links

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
Comparison to other LiIon batteries