Test/review of Efest IMR20700 3000mAh (Purple) 2017

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Test/review of Efest IMR20700 3000mAh (Purple) 2017

Efest IMR20700 3000mAh (Purple) 2017
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Official specifications:


  • Rated capacity: 3000mAh
  • Nominal voltage: 3.7V
  • Voltage at end of discharging: 2.5V
  • Max. charging current: 4A
  • Standard charge: 2A
  • Discharging current 30A
  • Charging temperature range: 0°C ~ 45°C
  • Discharging temperature range: -20°C ~ 75°C
  • Inner resistance: 20mOhm
  • Cell size: 20 (±0.20)mm x 70 (±0.2)mm

Efest%20IMR20700%203000mAh%20(Purple)%202017-info
Efest do also have a battery in one of the new sizes that is slightly larger than 18650. The extra size is used for better high current handling in this cell
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DSC_0292 DSC_0293
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Efest%20IMR20700%203000mAh%20(Purple)%202017-Capacity
The two batteries are not perfectly matched, there is a small difference. The batteries have fairly constant capacity at any current.
Efest%20IMR20700%203000mAh%20(Purple)%202017-Temp-15.0
Efest%20IMR20700%203000mAh%20(Purple)%202017-Temp-20.0
Efest%20IMR20700%203000mAh%20(Purple)%202017-Temp-30.0
At 30A they get very warm and I had to stop shortly before they where empty.
Efest%20IMR20700%203000mAh%20(Purple)%202017-CapacityTimeHours
Efest%20IMR20700%203000mAh%20(Purple)%202017-CapacityTime
Efest%20IMR20700%203000mAh%20(Purple)%202017-Energy
Efest%20IMR20700%203000mAh%20(Purple)%202017-PowerLoadTime
Efest%20IMR20700%203000mAh%20(Purple)%202017-TripCurrent
Efest%20IMR20700%203000mAh%20(Purple)%202017-Charge
Conclusion
This is a nice high current battery and the slightly large size compare to a 18650 can be seen on the improved performance.
This battery is mostly for people that needs well above 10A, for lower currents look at a 18650.
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/