eGo USB Passthrough Cable The eGo passthrough: is a manually operated battery that has an end cap, that can be removed to allow the user to plug the device in to a USB port, and therefore it can be used like apass-through. The battery can also be used like a standard eGo battery. The eGo passthrough: has a 5 click on/off button, which can be used to prevent unwanted activation when the device is not in use. When in the on position, you just push the button which will light up blue. Charging the eGo passthrough: takes about 3 hours, and can be charged in either of 2 ways, 1:Through a USB connection Simply unscrew the end cap and attach the USB cable, to use it as a pass through. When you click 5 times to switch it off, it stops unwanted activation, though, you could still use it, whilst it is charging. 2:Through a 510 (USB) charger / Wall adapter whilst not in use, though is not recommended When used as a battery, you can click 5 times to switch it off to stop unwanted activation.