Keeppower INR21700 4000mAh NH2140 (Black) 2019
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Official specifications:
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Capacity min.: 3900mAh
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Capacity typ.: 4000mAh
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Nominal voltage: 3.70V
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Charge voltage: 4.20+/-0.05V
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Standard discharge cut-off voltage: 2.50V
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Standard charge current: 2000mA
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Charge termination current: 200mA
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Max. continuous discharge current: 35A
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Max. pulse discharge current: 45A
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This is a high current cell with good capacity in the 21700 size.
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The two cell tracks very nicely, they do get hot at 30A continuous.
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Conclusion
These cells are good high current cells with very low internal resistance and a good amount of capacity.
Notes and links
The battery was supplied by Keeppower 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