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

[HKJ]

[SIZE=+3]UltraFire SJ18650 6000mAh (Black) 2015[/SIZE]

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)

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

The wrapper says that the battery is protection, this is not correct.

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.

[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

 

[Dubois]

What?? A bad Ultrafire cell?

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

 

[HKJ]

What?? A bad Ultrafire cell?

Big surprise
I have no more Ultrafire cells, it will probably be quality cells for some time now.

 

[SubLGT]

SJ18650? SJ = Super Junk

 

[CuriousOne]

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]

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.

 

[markr6]

I just tried some 6000mAh as well!

 

[StorminMatt]

I just tried some 6000mAh as well!

'Pants on fire' has double meaning here.

 

[blah9]

Haha, nice! Cool review.