The Variable Voltage Battery is a compact yet powerful 400mAh vape battery that’s compatible with most oil cartridges. While most batteries for disposable oil cartridges are single-temp, the Variable Voltage Battery enables you to adjust power so you not only vape ejuices but oils that require more temperature. Just a few clicks and you’re ready to vape in seconds. The Variable Voltage Battery is super compact, perfect for your pocket and easy to conceal in your hand. Conveniently, the 400mAh Variable Voltage Battery comes with a USB charger so you can charge from nearly anywhere. Expect excellent vapor production, portability, and convenience!