Efest IMR20700 3100mAh (Purple) 2018

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Official specifications: Efest%20IMR20700%203100mAh%20(Purple)%202018-info

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Efest%20IMR20700%203100mAh%20(Purple)%202018-Capacity

The batteries are not perfectly matches, but fairly close. They can handle 20A with problems, but at 30A they get too hot.

Efest%20IMR20700%203100mAh%20(Purple)%202018-Temp-20.0

Efest%20IMR20700%203100mAh%20(Purple)%202018-Temp-30.0

I forgot to mount the temperature sensor on one of the batteries.

Efest%20IMR20700%203100mAh%20(Purple)%202018-CapacityTimeHours

Efest%20IMR20700%203100mAh%20(Purple)%202018-CapacityTime

Efest%20IMR20700%203100mAh%20(Purple)%202018-Energy

Efest%20IMR20700%203100mAh%20(Purple)%202018-PowerLoadTime

Efest%20IMR20700%203100mAh%20(Purple)%202018-TripCurrent

Efest%20IMR20700%203100mAh%20(Purple)%202018-Charge



Conclusion

This is a nice high current battery and the slightly large size compare to a 18650 can be seen on the improved performance.
This battery is mostly for people that needs well above 10A, for lower currents look at a 18650.



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
Compare to 18650 and other batteries