Keeppower 16340 850mAh P1634C2 (Black) 2020
%202020/DSC_4115.jpg)
Official specifications:
- Voltage: 3.70V
- Rated capacity: 850mAh
- Minimum Capacity: 800mAh
- Discharge cut-off voltage: 2.50V
- Charge voltage: 4.20V +/- 0.05V
- Standard charge current: 500mA
- Maximum constant discharge current: 3A
%202020/Keeppower%2016340%20850mAh%20P1634C2%20(Black)%202020-info.png)
Protected LiIon 16340 batteries from Keeppower.
%202020/Keeppower%2016340%20850mAh%20P1634C2%20(Black)%202020-Capacity.png)
The two cells do not match perfectly, but being a protected cell it do not prevent using them in series.
%202020/Keeppower%2016340%20850mAh%20P1634C2%20(Black)%202020-Temp-2.0.png)
%202020/Keeppower%2016340%20850mAh%20P1634C2%20(Black)%202020-Temp-3.0.png)
%202020/Keeppower%2016340%20850mAh%20P1634C2%20(Black)%202020-CapacityTimeHours.png)
%202020/Keeppower%2016340%20850mAh%20P1634C2%20(Black)%202020-CapacityTime.png)
%202020/Keeppower%2016340%20850mAh%20P1634C2%20(Black)%202020-Energy.png)
%202020/Keeppower%2016340%20850mAh%20P1634C2%20(Black)%202020-PowerLoadTime.png)
%202020/Keeppower%2016340%20850mAh%20P1634C2%20(Black)%202020-TripCurrent.png)
%202020/Keeppower%2016340%20850mAh%20P1634C2%20(Black)%202020-Charge.png)

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