The Tornado T USB 650mAh battery is the upgraded version of the original Tornado-T e-cig battery. This 650mAh battery allows vapers to switch between regulated mode, which provides a constant output of 3.3V and unregulated mode, which changes the output power depending on the power capacity remaining in the battery. This e-cig battery also has a USB port, allowing vapers to use their e-cigarette whilst charging.
The ability to use regulated and unregulated mode, this means just a quick press of the button gives you the ability to change the range of voltage you are vaping at between 4.2 - 3.3V depending on the charge left in the battery. This function can be useful if you need that extra kick when using your device.