Got my batteries for my battery support my e-cigarettes bought. Thought "cool, 6000 mAh; I do not have so often invite". Think again! Those things do not hold times as long as my Samsung ICR18650-26F with 2600 mAh. and of the performance not to mention. The Samsung batteries give up to the end full power, the UltraFire gradually lose its performance. I use now only as a transition until the Samsung battery is fully charged. I advise everyone to do so; brings you something decent to batteries. The Samsung ICR18650-26F are more expensive but much, much better.
