Efest 18650 3400mAh bt (Black) 2014

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Official specifications:
Efest%2018650%203400mAh%20bt%20(Black)%202014-info

As usual with this type of cell I do not test the full capacity, because I stop at 2.8 volt, not the allowed minimum of 2.5 volt.

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Efest%2018650%203400mAh%20bt%20(Black)%202014-Capacity

Very nice discharge curves. Due to the protection circuit the 5A curve is a bit low and one of the batteries stops before it is fully discharge.

Efest%2018650%203400mAh%20bt%20(Black)%202014-CapacityTimeHours

Efest%2018650%203400mAh%20bt%20(Black)%202014-CapacityTime

Efest%2018650%203400mAh%20bt%20(Black)%202014-Energy

Efest%2018650%203400mAh%20bt%20(Black)%202014-PowerLoadTime

Efest%2018650%203400mAh%20bt%20(Black)%202014-TripCurrent

The protection trips at 6A, but, of course, the limit is lower for continuous draw.

Efest%2018650%203400mAh%20bt%20(Black)%202014-Charge



Conclusion

This is a very good battery.
The protection circuit limits the maximum continuous draw to 5A.



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