Soshine CR2 LiFePO4 400mAh (Black)
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Official specifications:
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Battery Capacity (Mfg Rated): 400 mAh
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Battery Chemistry: LiFePO4
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Battery Feature: Rechargeable
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Battery Form Factor: 15266
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Battery Rated Voltage: 3.0 V
/Soshine%20CR2%20LiFePO4%20400mAh%20(Black)-info.png)
A CR2 sizes LiIon battery with LiFePO4 chemistry (i.e. 3.2V).
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/Soshine%20CR2%20LiFePO4%20400mAh%20(Black)-Capacity.png)
The cells are not perfectly matches and only have about half the rated capacity, but the voltage is higher than printed on the cell (As expected).
/Soshine%20CR2%20LiFePO4%20400mAh%20(Black)-Temp-2.0.png)
These small cells do have have time to get really hot during discharge.
/Soshine%20CR2%20LiFePO4%20400mAh%20(Black)-CapacityTimeHours.png)
/Soshine%20CR2%20LiFePO4%20400mAh%20(Black)-CapacityTime.png)
On this curve is is easier to see that this type of cell has a fairly constant voltage, until they are empty.
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/Soshine%20CR2%20LiFePO4%20400mAh%20(Black)-PowerLoadTime.png)
/Soshine%20CR2%20LiFePO4%20400mAh%20(Black)-TripCurrent.png)
/Soshine%20CR2%20LiFePO4%20400mAh%20(Black)-Charge.png)
Conclusion
The cells are not very impressive, but I do not know if there are better CR2 sized cells on the market.
Notes and links
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
Comparison to other LiIon batteries