LoKey V2 Variable Voltage Battery by (LoKey Vape). The LOKEY V2 variable voltage battery is an incredibly discreet and compact device shaped like a key fob, specifically designed for vaporizing oil cartridges. It features three different voltage settings, allowing you to customize your vaping experience according to your preferences. With a 350mAh battery capacity, this versatile battery is compatible with all 510 thread cartridges. The convenience of this battery mod is enhanced by its built-in USB charger, which allows for seamless charging on the go whenever you need it.