Test/review of Efest IMR26650 4200mAh (Purple) 2017

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HKJ
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Test/review of Efest IMR26650 4200mAh (Purple) 2017

Efest IMR26650 4200mAh (Purple) 2017

DSC_0261

Official specifications:


  • Rated capacity: 4200mAh
  • Nominal voltage: 3.7V
  • Voltage at end of discharging: 2.5V
  • Max. charging current: 4A
  • Standard charge: 2A
  • Discharging current 35A
  • Pulse discharging current: 50A
  • Charging temperature range: 0°C ~ 45°C
  • Discharging temperature range: -20°C ~ 75°C
  • Inner resistance: 20mOhm
  • Cell size: 18.5 (±0.2)mm x 65.2 (±0.2)mm

Efest%20IMR26650%204200mAh%20(Purple)%202017-info

This is a high current 26650 battery.

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DSC_0262DSC_0263

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DSC_0265
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Efest%20IMR26650%204200mAh%20(Purple)%202017-Capacity

It do fairly good up to 20A, at 30A the cell is struggling a to handle the current.

Efest%20IMR26650%204200mAh%20(Purple)%202017-Temp-20.0

Efest%20IMR26650%204200mAh%20(Purple)%202017-Temp-30.0

At 30A I had to terminate the discharge a bit premature due to high temperature (I only had sensor on the B cell).

Efest%20IMR26650%204200mAh%20(Purple)%202017-CapacityTimeHours

Efest%20IMR26650%204200mAh%20(Purple)%202017-CapacityTime

Efest%20IMR26650%204200mAh%20(Purple)%202017-Energy

Efest%20IMR26650%204200mAh%20(Purple)%202017-PowerLoadTime

Efest%20IMR26650%204200mAh%20(Purple)%202017-TripCurrent

Efest%20IMR26650%204200mAh%20(Purple)%202017-Charge



Conclusion

This is a fairly good high current cell, but the rating is on the optimistic side.



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/

Barkuti
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It must be these “premium” brands think the consumer market is full of careless morons who just care about flashy figures on their battery wraps. If they were to face lawsuits because of unsafe performance claims another day would dawn. Sheesh! 

With regards to my previous “BMS as switch” question, here's a quote from the HY2120 datasheet:

“Notice: Discharging may not be enacted when the battery is first time connected. To regain normal status, CS and VSS pin must be shorted or the charger must be connected.”

Well, since I am going to use a driver which is only single mode, I guess this can work by connecting a momentary pushbutton between the CS and VSS pins. Big Smile

Thanks again for another review.

 

Cheers 

Lexel
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Just look at a fair labeled cell that beats the Efest, by a lot

Golisi IMR26650 Less voltage sag and rated 35A

 

Gj
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Thanks for the review. Thumbs Up