UltraFire BRC26650 7300mAh (Gray)

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Official specifications:
UltraFire%20BRC26650%207300mAh%20(Gray)-info

This cell is specified with record capacity, but the measurements does not confirm this.

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UltraFire%20BRC26650%207300mAh%20(Gray)-Capacity

The real capacity is about 2500mAh and the two cells do not track very well when current is above 3A.

UltraFire%20BRC26650%207300mAh%20(Gray)-CapacityTimeHours

UltraFire%20BRC26650%207300mAh%20(Gray)-CapacityTime

UltraFire%20BRC26650%207300mAh%20(Gray)-Energy

UltraFire%20BRC26650%207300mAh%20(Gray)-PowerLoadTime

UltraFire%20BRC26650%207300mAh%20(Gray)-TripCurrent

UltraFire%20BRC26650%207300mAh%20(Gray)-Charge



Conclusion

The cell is sold with wrong specifications, the performance is very bad and the wrapper lies about protection.
I will call this a bad cell.



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
Compare to 18650 and other batteries