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

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HKJ's picture
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Test / Review: UltraFire BRC18650 4000 mAh (Brown-Gold)

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


Official specifications:

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


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.




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.





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).




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

My website with reviews of many chargers and batteries (More than 1000): http://lygte-info.dk/

Edited by: sb56637 on 08/26/2014 - 17:46
Chicago X
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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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thanks for confirming suspicions...


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Nice review HKJ! 

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

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


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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...

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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.

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ralf wrote:

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



That is funny Big Smile