The Exxus Slim VV 380 mAh 510 Variable Voltage Battery by Exxus Vape is a simplistic device that is an easy companion to a number of tanks. As a variable voltage unit, its voltage can be adjusted to anywhere between 2.6V and 4V. This accommodates user's individual preferences. The Exxus Slim VV has a 510 thread attachment that make it a near universal fit for many mods on the market. Additionally, it boasts a ten second heat up time, so it's ready to fire fulfilling draws quickly and cleanly.