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

[size=+3]Efest IMR26650 4200mAh (Purple) 2017[/size]



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

This is a high current 26650 battery.











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





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















[size=+3]Conclusion[/size]

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



[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

Thanks for the review!

I am going to the comparator now to compare it to my Vappower and iJoy!

Edit: Just as I suspected...both the V'power and iJoy have LESS voltage sag. The V'power has significantly LESS Voltage sag than the Efest until 15Amps.

Don't miss comparing it to the Shockli 5500.

MAD777 said:

Don't miss comparing it to the Shockli 5500.

Click to expand...

That is another good one. At 7A Much better than the Efest and starting @ 3.9v it starts to sag less than my 4200 V'Power ,,,,,,,,,,,,Shockli also has 1300 more mAh which probably helps in that regard.

Capolini said:

That is another good one. At 7A Much better than the Efest and starting @ 3.9v it starts to sag less than my 4200 V'Power ,,,,,,,,,,,,Shockli also has 1300 more mAh which probably helps in that regard.

Click to expand...

Actually upon further contemplation the Extra capacity w/ the Shockli would not benefit my application.

I use the V'power in my Manker U21vn. After 15 to 20 minutes on MAX I put a fresh battery in. When I get home both batteries are ~ 3.90v to 3.92v.