Test / Review: UltraFire BRC18650 4000 mAh (Brown-Gold)

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HKJ
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Test of UltraFire BRC18650 4000 mAh (Brown-Gold) UltraFire BRC18650 4000 mAh (Brown-Gold)

DSC_0984

Official specifications:

  • Voltage: 3.7V
  • Actual Capacity: 2600mAh
  • Built-in PCB protection board
  • Package contains 2 batteries


UltraFire%20BRC18650%204000%20mAh%20(Brown-Gold)-info

This battery state 4000mAh on the cell, but at the current time the maximum possible is 3100mAh, i.e. something is wrong. The specification does list a lower capacity (2600mAh), but even that is too high, as can be seen. The internal resistance is also high for a 18650 battery, this makes them unsuitable for high loads.

DSC_0983

DSC_0988 DSC_0989
DSC_0985
DSC_0986
DSC_0987

UltraFire%20BRC18650%204000%20mAh%20(Brown-Gold)-Capacity

The traces shows around 2000mAh and the battery is not very good at high loads. The batteries do track, i.e. they have the same capacity and internal resistance.

UltraFire%20BRC18650%204000%20mAh%20(Brown-Gold)-CapacityTimeHours

UltraFire%20BRC18650%204000%20mAh%20(Brown-Gold)-CapacityTime

UltraFire%20BRC18650%204000%20mAh%20(Brown-Gold)-Energy

UltraFire%20BRC18650%204000%20mAh%20(Brown-Gold)-PowerLoadTime

This test shows that the current trip point is reduced when the battery gets warm (This is normal), here it stops at about 3.5A (This is a low value for a 18650 battery).

UltraFire%20BRC18650%204000%20mAh%20(Brown-Gold)-TripCurrent

UltraFire%20BRC18650%204000%20mAh%20(Brown-Gold)-Charge



Conclusion

The battery has much less capacity than stated on the cell, but they both have the same capacity, i.e. they can be used in series. The battery is only good for light loads.
Because the batteries are matched in capacity, I will call them acceptable for a cheap battery.



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

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Chicago X
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 Bottom line: The BRC cells

 

Bottom line: The BRC cells are STILL crap.

 

Thanks for the review !!!  I hope this mitigates the temptation of the (fake) 4000 mAh claimed capacity for those on the fence.

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dthrckt
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thanks for confirming

thanks for confirming suspicions...

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fishinfool
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Nice review HJK! 

Nice review HKJ! 

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my9221
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Garbage!

Thanks for the review. All batteries from Ultrafire are garbage!

ralf
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Confirmation

That confirms my guess that the specified 4000mAh is for both cells of a two-pack.... Laughing

 

Volk
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my9221 wrote:Thanks for

my9221 wrote:

Thanks for the review. All batteries from Ultrafire are garbage!

 

I don't know about that. I bought a pair of pink UltraFire 2600 from DX about 2 years ago. When they arrived they had about 2400-2500 mAh (don't remember the exact numbers) and since then they have been my most used batteries and they still perform. I did some measurements some time ago and they still hold about 2200mAh at 1A load. Considering the use they have seen I'm more than satisfied.

Link: http://www.dealextreme.com/p/ultrafire-protected-18650-3-7v-2600mah-lith...

brted
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Those BRC's have never been

Those BRC's have never been any good, but I think there are some decent Ultrafire cells out there. And a lot of fakes, so the problem is you never know what you are really getting.

CheapThrills
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ralf wrote:That confirms my

ralf wrote:

That confirms my guess that the specified 4000mAh is for both cells of a two-pack.... Laughing

 

 

That is funny Laughing out loud

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