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

UltraFire SJ18650 6000mAh (Black) 2015

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.

Mot much capacity, especially notif 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.


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.

Notes and links

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

Good value for the money, not! Thanks for the review!

All ultrafire batteries are junk and extremely risky!

It’s like the *Fire brand batteries are committing

robbery , just without pointing a weapon in your face !

I am not in the business I just want to do some spring cleaning.

I have a limited number of good laptop pulls for sale https://budgetlightforum.com/t/-/31628

again not my business just trying to clear out space and prevent folks from buying crap, its a win win.