Test/review of Vapcell INR21700 4000mAh K40 (Black) 2021

HKJ

Flashaholic
Joined
Mar 26, 2008
Messages
9,715
Location
Copenhagen, Denmark
[size=+3]Vapcell INR21700 4000mAh K40 (Black) 2021[/size]

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Official specifications:
  • Model: K40
  • Size: 21.1*70.6mm
  • Typical Capacity: 4000mAh (0.2C discharge)
  • Min capacity: 3900mAh (0.2C discharge)
  • Nominal voltage: 3.60V
  • Max Continuous Discharge Current: 30A
  • Max Discharge Current: 45A with 80°C cut
  • End-of-charge voltage: 4.20V
  • End-of-discharge Voltage: 2.5V
  • Weight: 68g ( Appr)
  • Internal resistance: 10mOhm ( Appr) AC 1kHz
  • Standard Charge: 2000mA,CCCV 100mA cut-off
  • Quick Charge Current: 6000mA
l%20INR21700%204000mAh%20K40%20(Black)%202021-info.png


This is a high current 21700 cell with good capacity.

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INR21700%204000mAh%20K40%20(Black)%202021-Capacity.png


The two cells tracks nicely and usable capacity do not go down much with higher loads.

NR21700%204000mAh%20K40%20(Black)%202021-Temp-15.0.png


NR21700%204000mAh%20K40%20(Black)%202021-Temp-20.0.png


NR21700%204000mAh%20K40%20(Black)%202021-Temp-30.0.png


204000mAh%20K40%20(Black)%202021-CapacityTimeHours.png


1700%204000mAh%20K40%20(Black)%202021-CapacityTime.png


20INR21700%204000mAh%20K40%20(Black)%202021-Energy.png


700%204000mAh%20K40%20(Black)%202021-PowerLoadTime.png


21700%204000mAh%20K40%20(Black)%202021-TripCurrent.png


20INR21700%204000mAh%20K40%20(Black)%202021-Charge.png


%20K40%20%28Black%29%202021-pulse-1.0%2010%2010-IR.png




[size=+3]Conclusion[/size]

These cells are good high current cells with a decent capacity.



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

The batteries was supplied by Vapcell 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
Graphical comparison to 18650 and other batteries
Table with all tested LiIon batteries
 

skid00skid00

Newly Enlightened
Joined
Dec 13, 2009
Messages
92
HKJ, how much time do you spend while reviewing a battery?

And thank you for providing info I can't get anywhere else!
 
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