UltraFire BRC32600 4000mAh 3.0V (Green-white)
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Official specifications:
- Voltage: 3.0V
- Capacity: 4000mAh
- No PCB protection board included
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This is LiFePO4 batteries, this means they are 3.2 volt nominal voltage. This voltage is to low for a typical 1xLiIon flashlight.
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The battery has a very flat discharge curve, where voltage depends on current draw, not on how much charge is left in the battery.
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This type of battery does not have a protection circuit, because the chemistry is safer.
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Conclusion
The performance is good for a cheap battery, but the capacity is overstated
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