Test/review of Vapcell INR21700 4200mAh T42 (Red) 2021



Mar 26, 2008
Copenhagen, Denmark
[size=+3]Vapcell INR21700 4200mAh T42 (Red) 2021[/size]

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Official specifications:
  • Model: T42
  • Size: 21.5*70.1mm
  • Typical Capacity: 4200mAh (0.2C discharge)
  • Min capacity: 4000mAh (0.2C discharge)
  • Nominal voltage: 3.60V
  • Max Continuous Discharge Current: 35A
  • Max Discharge Current: 50A with 80°C cut
  • End-of-charge voltage: 4.20V
  • End-of-discharge Voltage: 2.5V
  • Weight: 70g ( Appr)
  • Internal resistance: 8mOhm AC 1kHz
  • Standard Charge: 4000mA,CCCV 100mA cut-off
  • Quick Charge Current: 8000mA

Ell20INR21700204200mAh20T4220Red202021 info

This is a high current 21700 cell.

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20INR21700204200mAh20T4220Red202021 Capacity

The two cells matches nicely and capacity only drops slightly even with 30A load, as usual the temperature goes up at high load.

0INR21700204200mAh20T4220Red202021 Temp 150

0INR21700204200mAh20T4220Red202021 Temp 200

0INR21700204200mAh20T4220Red202021 Temp 300

0204200mAh20T4220Red202021 CapacityTimeHours

R21700204200mAh20T4220Red202021 CapacityTime

L20INR21700204200mAh20T4220Red202021 Energy

21700204200mAh20T4220Red202021 PowerLoadTime

NR21700204200mAh20T4220Red202021 TripCurrent

L20INR21700204200mAh20T4220Red202021 Charge

Ah20T422028Red29202021 pulse 1020102010 IR


This is a good high current cell.

[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