Didn't see this one mentioned anywhere...
How about a standard ecig, but with a quick plug usb cable that works just like existing USB batteries, but also charges the battery.
That way, when you're plugged in, you get full power from usb, and when it's time to go home you just unplug the usb portion from the end, and you have a fully charged battery to use during the drive.
Basically a USB cable with a mini connector that plugs into the end of the ecig. It will then charge the battery and power the smoke.
Sorry I had to post here... no permission to post anywhere else (at this time)

* no need to unscrew the usb battery and put on a real battery
How about a standard ecig, but with a quick plug usb cable that works just like existing USB batteries, but also charges the battery.
That way, when you're plugged in, you get full power from usb, and when it's time to go home you just unplug the usb portion from the end, and you have a fully charged battery to use during the drive.
Basically a USB cable with a mini connector that plugs into the end of the ecig. It will then charge the battery and power the smoke.
Sorry I had to post here... no permission to post anywhere else (at this time)
* no need to unscrew the usb battery and put on a real battery