TrustFire IMR21700 4000mAh (Black) 2019
%202019/DSC_4862.jpg)
Official specifications:
-
Voltage: 3.7V
-
Capacity: 4000mAh
-
Cycle life: 1000 cycles
%202019/TrustFire%20IMR21700%204000mAh%20(Black)%202019-info.png)
A 21700 high current cell from Trustfire.
%202019/DSC_4860.jpg)
%202019/DSC_4861.jpg)
%202019/DSC_4863.jpg)
%202019/DSC_4864.jpg)
%202019/DSC_4865.jpg)
%202019/DSC_4866.jpg)
%202019/DSC_4867.jpg)
%202019/TrustFire%20IMR21700%204000mAh%20(Black)%202019-Capacity.png)
The two cells are not matched very well, but maintain their capacity at just about any load.
%202019/TrustFire%20IMR21700%204000mAh%20(Black)%202019-Temp-15.0.png)
%202019/TrustFire%20IMR21700%204000mAh%20(Black)%202019-Temp-20.0.png)
The battery got hot and I stopped the test.
%202019/TrustFire%20IMR21700%204000mAh%20(Black)%202019-Temp-30.0.png)
%202019/TrustFire%20IMR21700%204000mAh%20(Black)%202019-CapacityTimeHours.png)
%202019/TrustFire%20IMR21700%204000mAh%20(Black)%202019-CapacityTime.png)
%202019/TrustFire%20IMR21700%204000mAh%20(Black)%202019-Energy.png)
%202019/TrustFire%20IMR21700%204000mAh%20(Black)%202019-PowerLoadTime.png)
%202019/TrustFire%20IMR21700%204000mAh%20(Black)%202019-TripCurrent.png)
%202019/TrustFire%20IMR21700%204000mAh%20(Black)%202019-Charge.png)
Conclusion
The cells can deliver up to about 15A continuous and has a good amount of capacity.
Notes and links
The batteries was supplied by Trustfire 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