Efest 18350 900mAh (Black) 2014

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Official specifications:
Efest%2018350%20%20900mAh%20(Black)%202014-info

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DSC_4118 DSC_4119

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Efest%2018350%20%20900mAh%20(Black)%202014-Capacity

The two cells has very different capacity, this is not very good.

Efest%2018350%20%20900mAh%20(Black)%202014-CapacityTimeHours

Efest%2018350%20%20900mAh%20(Black)%202014-CapacityTime

Efest%2018350%20%20900mAh%20(Black)%202014-Energy

Efest%2018350%20%20900mAh%20(Black)%202014-PowerLoadTime

Efest%2018350%20%20900mAh%20(Black)%202014-TripCurrent

On this chart the difference in performance is very obvious.
I also wonder about the protection, one battery is below 2.5 volt, before the protection activates (it is probably the low volt protection, not the over current protection).

Efest%2018350%20%20900mAh%20(Black)%202014-Charge



Conclusion

One of the batteries has an acceptable performance, the other do not.
With this much difference between cells, I cannot recommend this battery.



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