Ever feel like your ego batteries need some more bling besides a wrap? Fear no more! Introducing the E-Fire wooden sleeved batteries - slightly thicker than your standard ego battery, the E-Fire is a 1000mAh variable voltage battery that ranges from 3.3v to 4.8v by simply twisting the dial at the bottom. It has both recessed ego style and 510 threading to accept almost all your tank/atomizer combinations. It also includes a beauty ring to cover your threads when using the 510 threading.