Efest IMR18650 3500mAh (Purple) 2017

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Official specifications:
Efest%20IMR18650%203500mAh%20(Purple)%202017-info

A high capacity 18650 battery that can deliver a fair amount of current.

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Efest%20IMR18650%203500mAh%20(Purple)%202017-Capacity

The discharge curves shows nice tracking between the two cells. The battery has very low voltage at 20A.

Efest%20IMR18650%203500mAh%20(Purple)%202017-Temp-10.0

The battery gets very warm at 10A discharge current.

Efest%20IMR18650%203500mAh%20(Purple)%202017-Temp-15.0

At 15A I had to stop the discharge due to temperature.

Efest%20IMR18650%203500mAh%20(Purple)%202017-Temp-20.0

I also had to stop at 20A.

Efest%20IMR18650%203500mAh%20(Purple)%202017-CapacityTimeHours

Efest%20IMR18650%203500mAh%20(Purple)%202017-CapacityTime

Efest%20IMR18650%203500mAh%20(Purple)%202017-Energy

Efest%20IMR18650%203500mAh%20(Purple)%202017-PowerLoadTime

Efest%20IMR18650%203500mAh%20(Purple)%202017-TripCurrent

Efest%20IMR18650%203500mAh%20(Purple)%202017-Charge



Conclusion

The cell looks very good, it has lot of capacity and can handle some current, but I will not recommend it above 10A.



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
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Compare to 18650 and other batteries