Introducing EVOD battery by Kangertech, now with USB Passthrough function! You can charge these batteries with the included standard mini-USB cable, or the standard eGo charger (sold separately). Passthrough function allows you to use the device while it's charging through the mini-USB port at the bottom. You will no longer have to remove the tank or clearomizer to charge either! Includes a metal cap that unscrews to cover the USB port. Also features LED charge indicator.