UltraFire 16340 650mAh (Red-black)
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Official specifications:
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Battery Capacity (Mfg Rated): 650 mAh
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Battery Chemistry: Li-Ion
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Battery Feature: Rechargeable
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Battery Form Factor: BRC 16340
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Battery Rated Voltage: 3.7 V
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This is a fairly new style packing from UltraFire, but is the contents any good?
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One of the cell has the rated capacity, the other have less capacity and neither of them can deliver more than 1A to 2A. This do not look like a high current cell.
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Conclusion
This battery is not a high current battery and the mismatch between the two cells is rather high.
It looks like it has a working overload protection, but at a way to high value.
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