Efest IMR18650 3100mAh (Purple) 2017



Official specifications:

• Capacity: 3100mAh
• Nominal voltage: 3.7V
• Voltage at end of discharging: 2.5V
• Max charging current: 4A
• Standard charge: 2A
• Discharge current: 10A
• Pulse discharge current: 20A
• Charging temperature range: 0° ~ 45°C
• Discharging temperature range: -20°C ~ 75°C
• Inner resistance: 20mOhm
• Cell size: 18.50 (±0.2)mm x 65.20 (±0.2)mm

A 18650 with 3100mAh and fairly high current.



I like the plastic box Efest uses, it is made to protect the battery from impacts.









The discharge curves tracks very fine.



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



That means it did run the full discharge curve and got fairly warm



Especially at 20A (It did not work anymore after this test). This also shows that it has proper safety, that disables the battery if it gets way too hot.















Conclusion

This cell has good performance at moderate current, but it is not a super high current cell.



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