Test/review of Eizfan IMR20700 3100mAh (Black-yellow) 2018

HKJ

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[size=+3]Eizfan IMR20700 3100mAh (Black-yellow) 2018[/size]

DSC_4721.jpg


Official specifications:
  • Rated Capacity: 3100mAh
  • Continuous Discharge Current: 30A
  • Max. Short Peak Discharge CC: 40A
  • Rated Voltage: 3.7V
  • Internal Resistance: <30mOhm
  • Cut-off Discharge Voltage: 2.5V
  • Charge Upper Limit Voltage: 4.20±0.05V
  • Charging Metod: CC/CV 4.20V
  • Charging Time(Std): 4.0hours
  • Standard Charging Current: 0.2C A
  • Charging Current: 0.5C A
  • Standard Discharging Current: 0.2C A
  • Fast Discharging Current: 0.5C A
  • Max Discharging Current: 2C A
  • Weight: about 60g
  • Size: 20*70mm
  • Version: Flat Top
  • Operational Temperature: Charge (0 ~ 50°C)

Eizfan%20IMR20700%203100mAh%20(Black-yellow)%202018-info.png


This is high current cells and due to that the capacity is fairly low for this size.

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Eizfan%20IMR20700%203100mAh%20(Black-yellow)%202018-Capacity.png


The discharge curves tracks nicely at any tested current, at 30A I terminated the discharge a bit early due to the temperature.

Eizfan%20IMR20700%203100mAh%20(Black-yellow)%202018-Temp-20.0.png


Eizfan%20IMR20700%203100mAh%20(Black-yellow)%202018-Temp-30.0.png


Eizfan%20IMR20700%203100mAh%20(Black-yellow)%202018-CapacityTimeHours.png


Eizfan%20IMR20700%203100mAh%20(Black-yellow)%202018-CapacityTime.png


Eizfan%20IMR20700%203100mAh%20(Black-yellow)%202018-Energy.png


Eizfan%20IMR20700%203100mAh%20(Black-yellow)%202018-PowerLoadTime.png


Eizfan%20IMR20700%203100mAh%20(Black-yellow)%202018-TripCurrent.png


Eizfan%20IMR20700%203100mAh%20(Black-yellow)%202018-Charge.png




[size=+3]Conclusion[/size]

The battery works well above 10A, but may be too hot at 30A continuous discharge.



[size=+3]Notes and links[/size]

Batteries was supplied by Eizfan (Efan) 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
Graphical comparison to 18650 and other batteries
Table with all tested LiIon batteries
 
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