TrustFire IMR21700 4000mAh (Black) 2019
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Official specifications:
- Voltage: 3.7V
- Capacity: 4000mAh
- Cycle life: 1000 cycles
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A 21700 high current cell from Trustfire.
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The two cells are not matched very well, but maintain their capacity at just about any load.
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The battery got hot and I stopped the test.
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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