If you want an ultimate stick battery but don't want it rolling off your desk, or want a solid high-performance feel, Quatro by HoneyStick is the perfect battery. who Says that a 510 pen battery has to be round? This cube can fit in your pocket very snug with your favorite 510 thread prefilled cartridge. It has 400 MAH capacity meaning you can run this workhorse long and hard before needing a charger, it has 3 power settings maxing out at 4.2 Volts also a useful preheat function. It has a micro USB charging port on the foot of the battery and 15W of output performance.