Test/Review of UltraFire SJ18650 6000mAh (Black) 2015

HKJ

Flashaholic
Joined
Mar 26, 2008
Messages
9,713
Location
Copenhagen, Denmark
[SIZE=+3]UltraFire SJ18650 6000mAh (Black) 2015[/SIZE]

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Official specifications:
  • Color: Black
  • Type: Rechargeable li-ion battery
  • Model: 18650
  • Voltage: 3.7V
  • Capacity: 6000mAh
  • Size: Approx. 6.6 * 1.8cm / 2.6 * 0.7in (Height * diameter)

UltraFire%20SJ18650%206000mAh%20(Black)%202015-info.png


The cell is not surprisingly significantly below specified capacity. The promised protection is missing.

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The wrapper says that the battery is protection, this is not correct.
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UltraFire%20SJ18650%206000mAh%20(Black)%202015-Capacity.png


Not much capacity, especially not if you need a couple of amperes. This cell has less capacity than the 2014 version of the same cell. The two cells do track, but not very well.

UltraFire%20SJ18650%206000mAh%20(Black)%202015-CapacityTimeHours.png


UltraFire%20SJ18650%206000mAh%20(Black)%202015-CapacityTime.png


UltraFire%20SJ18650%206000mAh%20(Black)%202015-Energy.png


UltraFire%20SJ18650%206000mAh%20(Black)%202015-PowerLoadTime.png


UltraFire%20SJ18650%206000mAh%20(Black)%202015-TripCurrent.png


UltraFire%20SJ18650%206000mAh%20(Black)%202015-Charge.png




[SIZE=+3]Conclusion[/SIZE]

A cheap cell in bad quality, but I did already know that before I tested the cell. The disassembly did also confirm it (see link below).
The rating is, of course, that it is a badcell, but in another way than the red/silver Ultrafire I also disassembled. This cell is produced to be cheap, the red/silver is made from old cell.



[SIZE=+3]Notes and links[/SIZE]

Last years review of same cell
I disassembled the battery to see whats inside

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
 
Last edited:

Dubois

Enlightened
Joined
Feb 12, 2012
Messages
660
What?? A bad Ultrafire cell?

Important to have this confirmation for those who are uncertain about using these batteries. Good job, again, HKJ - thanks.
 

CuriousOne

Enlightened
Joined
Oct 14, 2012
Messages
808
SJ stands for ShenJen, since when chinese people pronounce ShenZhen, it sounds more like ShenJen.

I also got for testing 6000mah ultrafires, but in red color. Inner resistance is low and consistent, cells appear to be freshly made, all 8 pcs stripped were looking the same, for sure, no repacked cells. Just capacity sucks - around 480 mah each :)
 

LeafSamurai

Enlightened
Joined
Oct 29, 2014
Messages
259
Location
Christchurch, NZ
No surprises in this test/review whatsoever. Ultrafire performed as bad as we think it should and it just goes to show that good quality cells are worth it in the long run even though they cost more.
 
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