Test/review of Efest IMR18650 3100mAh (Purple) 2017

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Test/review of Efest IMR18650 3100mAh (Purple) 2017

Efest IMR18650 3100mAh (Purple) 2017

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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

Efest%20IMR18650%203100mAh%20(Purple)%202017-info

A 18650 with 3100mAh and fairly high current.

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

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Efest%20IMR18650%203100mAh%20(Purple)%202017-Capacity

The discharge curves tracks very fine.

Efest%20IMR18650%203100mAh%20(Purple)%202017-Temp-10.0

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

Efest%20IMR18650%203100mAh%20(Purple)%202017-Temp-15.0

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

Efest%20IMR18650%203100mAh%20(Purple)%202017-Temp-20.0

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.

Efest%20IMR18650%203100mAh%20(Purple)%202017-CapacityTimeHours

Efest%20IMR18650%203100mAh%20(Purple)%202017-CapacityTime

Efest%20IMR18650%203100mAh%20(Purple)%202017-Energy

Efest%20IMR18650%203100mAh%20(Purple)%202017-PowerLoadTime

Efest%20IMR18650%203100mAh%20(Purple)%202017-TripCurrent

Efest%20IMR18650%203100mAh%20(Purple)%202017-Charge



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

My website with reviews of many chargers and batteries (More than 1000): http://lygte-info.dk/