Test/review of Efest IMR18650 2500mAh (Purple) 2017

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HKJ
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Test/review of Efest IMR18650 2500mAh (Purple) 2017

Efest IMR18650 2500mAh (Purple) 2017
DSC_0284
Official specifications:


  • Rated capacity: 2500mAh
  • Nominal voltage: 3.7V
  • Voltage at end of discharging: 2.5V
  • Max. charging current: 4A
  • Standard charge: 2A
  • Discharging current 20A
  • Pulse discharging current: 35A
  • 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%202500mAh%20(Purple)%202017-info
A 2500mAh high current 18650 cell.
DSC_0282 DSC_0283
DSC_0285 DSC_0286
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Efest%20IMR18650%202500mAh%20(Purple)%202017-Capacity
The discharge curves looks very good with nearly constant capacity up to 20A.
Efest%20IMR18650%202500mAh%20(Purple)%202017-Temp-15.0
Efest%20IMR18650%202500mAh%20(Purple)%202017-Temp-20.0
The cell do get fairly hot at 20A as can be seen I stopped discharge on one of the cells.
Efest%20IMR18650%202500mAh%20(Purple)%202017-Temp-30.0
At 30A the cells did not get as warm. It is a new battery holder because the old one was damaged (Heat melted something in it).
Efest%20IMR18650%202500mAh%20(Purple)%202017-CapacityTimeHours
Efest%20IMR18650%202500mAh%20(Purple)%202017-CapacityTime
Efest%20IMR18650%202500mAh%20(Purple)%202017-Energy
Efest%20IMR18650%202500mAh%20(Purple)%202017-PowerLoadTime
Efest%20IMR18650%202500mAh%20(Purple)%202017-TripCurrent
Efest%20IMR18650%202500mAh%20(Purple)%202017-Charge
Conclusion
The batteries looks like a good battery, but compare to the Efest 2600 I wonder why they have this battery (It may be due to price).
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/