Check out the Top Twist, our newest variable voltage 510 vape battery! The Top Twist allows you to smoke while charging because all of the main controls are located on top rather than the bottom. Preheating, USB smart charging, a voltage range of 3.3V to 4.8V, and other features combine to make this gadget a stylish, dependable, and enjoyable way to use your favorite 510 cart! With a strong & sturdy construction and available in 6 vibrant colors.