Efest IMR18650 2500mAh (Purple) 2016

DSC_3252

Official specifications:
Efest%20IMR18650%202500mAh%20(Purple)%202016-info

A 2500mAh battery with a fairly high current rating.

DSC_3251

DSC_3253 DSC_3254

DSC_3255
DSC_3256
DSC_3257

Efest%20IMR18650%202500mAh%20(Purple)%202016-Capacity

The discharge curves look very good, they tracks perfectly and capacity is nearly constant.
The battery got warm at the higher current and I had to stop.

Efest%20IMR18650%202500mAh%20(Purple)%202016-Temp-15.0

Efest%20IMR18650%202500mAh%20(Purple)%202016-Temp-20.0

I stopped this discharge a bit early due to temperature.

Efest%20IMR18650%202500mAh%20(Purple)%202016-Temp-30.0

For now I am running with a fairly low maximum temperature (This trace here melted one battery holder).
Remember the traces are temperature increase, i.e. the actual battery temperature is 25-30C higher.

Efest%20IMR18650%202500mAh%20(Purple)%202016-CapacityTimeHours

Efest%20IMR18650%202500mAh%20(Purple)%202016-CapacityTime

Efest%20IMR18650%202500mAh%20(Purple)%202016-Energy

Efest%20IMR18650%202500mAh%20(Purple)%202016-PowerLoadTime

Only B battery is valid, the holder for A is melted.

Efest%20IMR18650%202500mAh%20(Purple)%202016-TripCurrent

Only B battery is valid, the holder for A is melted.

Efest%20IMR18650%202500mAh%20(Purple)%202016-Charge



Conclusion

The battery has good performance, but gets warm at 30A (Not a big surprise).



Notes and links

The batteries was supplied by Efest for a 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