Test/review of Efest IMR18650 2100mAh (Purple) 2017

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HKJ
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Test/review of Efest IMR18650 2100mAh (Purple) 2017

Efest IMR18650 2100mAh (Purple) 2017
DSC_0814
Official specifications:


  • Rated capacity: 2100mAh
  • Nominal voltage: 3.7V
  • Voltage at end of discharging: 2.5V
  • Max. charging current: 4A
  • Standard charge: 2A
  • Discharging current 25A
  • Pulse discharging current: 38A
  • Charging temperature range: 0°C ~ 45°C
  • Discharging temperature range: -20°C ~ 75°C
  • Inner resistance: 20mOhm
  • Cell size: 18.50 (±0.20)mm x 65.20 (±0.2)mm

Efest%20IMR18650%202100mAh%20(Purple)%202017-info
A high current cell with fairly low capacity.
DSC_0812 DSC_0813
DSC_0815 DSC_0816
DSC_0817
DSC_0818
DSC_0819
Efest%20IMR18650%202100mAh%20(Purple)%202017-Capacity
The discharge curves looks very good with tracking and about constant capacity up to 20A.
Efest%20IMR18650%202100mAh%20(Purple)%202017-Temp-15.0
Efest%20IMR18650%202100mAh%20(Purple)%202017-Temp-20.0
Efest%20IMR18650%202100mAh%20(Purple)%202017-Temp-30.0
The cell gets hot at 30A, but not too hot.
I have a suspicion that I did not mount the temperature sensor for the B cell correctly.
Efest%20IMR18650%202100mAh%20(Purple)%202017-CapacityTimeHours
Efest%20IMR18650%202100mAh%20(Purple)%202017-CapacityTime
Efest%20IMR18650%202100mAh%20(Purple)%202017-Energy
Efest%20IMR18650%202100mAh%20(Purple)%202017-PowerLoadTime
Efest%20IMR18650%202100mAh%20(Purple)%202017-TripCurrent
Efest%20IMR18650%202100mAh%20(Purple)%202017-Charge
Conclusion
The test shows a good quality cell that can deliver lot of current, but the capacity is not very high by todays standard.
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): https://lygte-info.dk/

Barkuti
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I'd have said this cell to be a Sony VTC4 rewrap but seems a bit better, no overheating at 30A. ¿?

 

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shadockan
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Some LG from the HD series