Test/review of Efest IMR20700 3100mAh (Purple) 2018

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HKJ
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Test/review of Efest IMR20700 3100mAh (Purple) 2018

Efest IMR20700 3100mAh (Purple) 2018
DSC_0636
Official specifications:


  • Rated capacity: 3100mAh
  • Nominal voltage: 3.7V
  • Voltage at end of discharging: 2.5V
  • Maximum charging current: 4A
  • Standard charging current: 2A
  • Maximum discharge current: 30A
  • Charging temperature range: 0°C ~ 45°C
  • Discharging temperature range: -20°C ~ 75°C
  • Inner resistance: 20mOhm

Efest%20IMR20700%203100mAh%20(Purple)%202018-info
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DSC_0637 DSC_0638
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Efest%20IMR20700%203100mAh%20(Purple)%202018-Capacity
The batteries are not perfectly matches, but fairly close. They can handle 20A with problems, but at 30A they get too hot.
Efest%20IMR20700%203100mAh%20(Purple)%202018-Temp-20.0
Efest%20IMR20700%203100mAh%20(Purple)%202018-Temp-30.0
I forgot to mount the temperature sensor on one of the batteries.
Efest%20IMR20700%203100mAh%20(Purple)%202018-CapacityTimeHours
Efest%20IMR20700%203100mAh%20(Purple)%202018-CapacityTime
Efest%20IMR20700%203100mAh%20(Purple)%202018-Energy
Efest%20IMR20700%203100mAh%20(Purple)%202018-PowerLoadTime
Efest%20IMR20700%203100mAh%20(Purple)%202018-TripCurrent
Efest%20IMR20700%203100mAh%20(Purple)%202018-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/

DavidEF
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Location: Salisbury, North Carolina, USA

I dunno. I still feel like there ought to be more gain moving to such a larger cell. It has nearly one third more volume than 18650 size. Shouldn’t we be getting solid 25A+ performance AND ~3400mAh capacity at the same time?

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