Efest IMR18650 2500mAh (Purple) 2016



Official specifications:

• Typical Capacity: 2500 mAh
• Nominal Voltage: 3.7V
• Discharge End Voltage: 3.0V
• Standard Charging Current: 1.5A
• Charging Voltage: 4.20+-0.05V
• Max Pulse Discharging Current: 35A
• Dimensions: 65.11mm (L) x 18.44 mm (D)
• Weight: 46g

A 2500mAh battery with a fairly high current rating.











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.





I stopped this discharge a bit early due to temperature.



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 25-30°C higher.









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



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





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