Keeppower 16340 850mAh P1634C2 (Black) 2020
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Official specifications:
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Voltage: 3.70V
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Rated 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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Standard charge current: 500mA
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Maximum constant discharge current: 3A
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Protected LiIon 16340 batteries from Keeppower.
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The two cells do not match perfectly, but being a protected cell it do not prevent using them in series.
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Conclusion
The battery has good capacity for its size and protected makes it safe to use in series configurations, but as usually for protected cells it is a bit longer than a standard cell.
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