Test/review of Efest IMR18650 3100mAh (Purple) 2017

HKJ

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Mar 26, 2008
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9,715
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Copenhagen, Denmark
[size=+3]Efest IMR18650 3100mAh (Purple) 2017[/size]

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Official specifications:
  • Capacity: 3100mAh
  • Nominal voltage: 3.7V
  • Voltage at end of discharging: 2.5V
  • Max charging current: 4A
  • Standard charge: 2A
  • Discharge current: 10A
  • Pulse discharge current: 20A
  • Charging temperature range: 0° ~ 45°C
  • Discharging temperature range: -20°C ~ 75°C
  • Inner resistance: 20mOhm
  • Cell size: 18.50 (±0.2)mm x 65.20 (±0.2)mm

Efest%20IMR18650%203100mAh%20(Purple)%202017-info.png


A 18650 with 3100mAh and fairly high current.

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I like the plastic box Efest uses, it is made to protect the battery from impacts.

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Efest%20IMR18650%203100mAh%20(Purple)%202017-Capacity.png


The discharge curves tracks very fine.

Efest%20IMR18650%203100mAh%20(Purple)%202017-Temp-10.0.png


I forgot to put the temperature sensor on one of the batteries.

Efest%20IMR18650%203100mAh%20(Purple)%202017-Temp-15.0.png


That means it did run the full discharge curve and got fairly warm

Efest%20IMR18650%203100mAh%20(Purple)%202017-Temp-20.0.png


Especially at 20A (It did not work anymore after this test). This also shows that it has proper safety, that disables the battery if it gets way too hot.

Efest%20IMR18650%203100mAh%20(Purple)%202017-CapacityTimeHours.png


Efest%20IMR18650%203100mAh%20(Purple)%202017-CapacityTime.png


Efest%20IMR18650%203100mAh%20(Purple)%202017-Energy.png


Efest%20IMR18650%203100mAh%20(Purple)%202017-PowerLoadTime.png


Efest%20IMR18650%203100mAh%20(Purple)%202017-TripCurrent.png


Efest%20IMR18650%203100mAh%20(Purple)%202017-Charge.png




[size=+3]Conclusion[/size]

This cell has good performance at moderate current, but it is not a super high current cell.



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

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
 

Chaitanya

Banned
Joined
Jun 22, 2014
Messages
182
Location
Pune(India)
Thanks for review, so this new IMR 3100 cells seems to be the sweet spot where Panasonic/Sanya 3400 mAh cells was sitting.
 

CuriousOne

Enlightened
Joined
Oct 14, 2012
Messages
813
This is relabeled Panasonic NCR18650BE cell, which is not a high drain cell by any means, and even at 10A discharge is pushing it's boundaries.
 
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