Test/Review of Efest IMR18650 2500mAh (Purple) 2016

1 post / 0 new
HKJ
HKJ's picture
Offline
Last seen: 2 weeks 2 days ago
Joined: 05/24/2011 - 12:23
Posts: 7447
Location: Copenhagen, Denmark
Test/Review of Efest IMR18650 2500mAh (Purple) 2016

Efest IMR18650 2500mAh (Purple) 2016
DSC_3252
Official specifications:


  • Typical Capacity: 2500 mAh
  • Nominal Voltage: 3.7V
  • Discharge End Voltage: 3.0V
  • Standard Charging Current: 1.5A
  • Charging Voltage: 4.20+-0.05V
  • Max Pulse Discharging Current: 35A
  • Dimensions: 65.11mm (L) x 18.44 mm (D)
  • Weight: 46g

Efest%20IMR18650%202500mAh%20(Purple)%202016-info
A 2500mAh battery with a fairly high current rating.
DSC_3251
DSC_3253 DSC_3254
DSC_3255
DSC_3256
DSC_3257
Efest%20IMR18650%202500mAh%20(Purple)%202016-Capacity
The discharge curves look very good, they tracks perfectly and capacity is nearly constant.
The battery got warm at the higher current and I had to stop.
Efest%20IMR18650%202500mAh%20(Purple)%202016-Temp-15.0
Efest%20IMR18650%202500mAh%20(Purple)%202016-Temp-20.0
I stopped this discharge a bit early due to temperature.
Efest%20IMR18650%202500mAh%20(Purple)%202016-Temp-30.0
For now I am running with a fairly low maximum temperature (This trace here melted one battery holder).
Remember the traces are temperature increase, i.e. the actual battery temperature is 25-30°C higher.
Efest%20IMR18650%202500mAh%20(Purple)%202016-CapacityTimeHours
Efest%20IMR18650%202500mAh%20(Purple)%202016-CapacityTime
Efest%20IMR18650%202500mAh%20(Purple)%202016-Energy
Efest%20IMR18650%202500mAh%20(Purple)%202016-PowerLoadTime
Only B battery is valid, the holder for A is melted.
Efest%20IMR18650%202500mAh%20(Purple)%202016-TripCurrent
Only B battery is valid, the holder for A is melted.
Efest%20IMR18650%202500mAh%20(Purple)%202016-Charge
Conclusion
The battery has good performance, but gets warm at 30A (Not a big surprise).
Notes and links
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/