Keeppower 16340 800mAh P1680U (Blue-white) 2020
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Official specifications:
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Voltage: 3.60V
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Typical capacity: 850mAh
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Minimum Capacity: 800mAh
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Discharge cut-off voltage: 2.50V
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Charge voltage: 4.20V +/- 0.05V
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USB Charge voltage: 5V +/- 0.5V
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Standard charge current: 330mA
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Maximum constant discharge current: 1.8A
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A LiIon 16340/RCR123A that can be charged from USB.
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The cells matches nicely and can deliver the rated 1.8A with not that much capacity loss.
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Conclusion
This looks like good 16340 cells with fine capacity. The basic cell is smaller than standard unprotected 16340, for this reason the final cell is only 2mm longer than the standard for 16340 cells.
Notes and links
The batteries 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 other LiIon batteries
Table with all tested LiIon batteries