UltraFire TR18650 5000mAh (Blue)

Why buy expensive 3400mAh cells when you can get 5000mAh cells much cheaper? I believe this test answers that question.

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Official specifications:
UltraFire%20TR18650%205000mAh%20(Blue)-info

The cell does not live up to its rated capacity, it is only about 1000mAh and cannot deliver high current.

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The button top looks nice, but is missing the vent holes.

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The battery was not sold as a protected battery, but the wrapper says it has protection (It does not have protection).

UltraFire%20TR18650%205000mAh%20(Blue)-Capacity

The capacity is not the same between the cells and it starts to lose capacity at 2A to 3A.

UltraFire%20TR18650%205000mAh%20(Blue)-CapacityTimeHours

UltraFire%20TR18650%205000mAh%20(Blue)-CapacityTime

UltraFire%20TR18650%205000mAh%20(Blue)-Energy

UltraFire%20TR18650%205000mAh%20(Blue)-PowerLoadTime

UltraFire%20TR18650%205000mAh%20(Blue)-TripCurrent

UltraFire%20TR18650%205000mAh%20(Blue)-Charge



Conclusion

They capacity is way lower then any normal cell and it cannot deliver much current. I wonder if the missing vent holes are because the internal cell protection (PTC & CID) is missing?

This is what I call a bad cell.



Notes and links

This cell is sold in many colors, where I bought it the actual color is random.

For a look at the inside of this cell: Disassembly of cheap 18650 battery

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