Test/review of Efest IMR14500 650mAh (Purple) 2017

HKJ

Flashaholic
Joined
Mar 26, 2008
Messages
9,715
Location
Copenhagen, Denmark
[size=+3]Efest IMR14500 650mAh (Purple) 2017[/size]

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Official specifications:
  • Capacity: 650mAh
  • Charging Voltage: 4.2v
  • Maximum Discharge Current: 6.5A
  • Maximum Pulse Current: 9.75A
  • Maximum Charge Current: 650mA (1C)
  • Recommended Discharge Termination: 2.75v

Efest%20IMR14500%20650mAh%20(Purple)%202017-info.png


14500, i.e. AA sized LiIon batteries from Efest, rated for good capacity and high current.

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Efest%20IMR14500%20650mAh%20(Purple)%202017-Capacity.png


The discharge curves tracks kust about prefectly and the batteries can deliver nearly 7A before capacity starts to drop. This looks good.

Efest%20IMR14500%20650mAh%20(Purple)%202017-Temp-7.0.png


Temperature also looks fine at 7A

Efest%20IMR14500%20650mAh%20(Purple)%202017-CapacityTimeHours.png


Efest%20IMR14500%20650mAh%20(Purple)%202017-CapacityTime.png


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Efest%20IMR14500%20650mAh%20(Purple)%202017-TripCurrent.png


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[size=+3]Conclusion[/size]

Performance looks very good on these cell, both capacity and current handling is good.



[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
Comparison to other LiIon batteries
 

SubLGT

Flashlight Enthusiast
Joined
Nov 18, 2013
Messages
1,183
Location
Idaho, USA
It's good to see that Efest has printed a realistic capacity and discharge current on these batteries. I hope they continue with this trend.
 

CuriousOne

Enlightened
Joined
Oct 14, 2012
Messages
813
The question is, who makes these cells, and are they initially designed for such a large currents?

Remember Efest selling relabeled NCR18650BE cells as high current ones, when these were not such current able at all?
 
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