UltraFire TR18650 5000mAh (Blue)

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



Official specifications:

• 100% brand new 2x 18650 3.7V Li-ion 5000mAh UltraFire rechargeable batteries
• Perfect for Flashlight, Rc toy or electronic gadgets
• 100% QC of every battery
• Capacity: 5000mAh
• Voltage: 3.7V
• Chemistry: Li-ion
• Recharge: up to 1000 cycles

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




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




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



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















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