Smart TV Stick (Android) connects to 3g dongle for Internet

I am trying to explore the options of connecting a 3g dongle to the car charger. And then connecting a Smart TV Android stick into the 3g dongle to get Internet. It will be great if I can get internet from the USB connection and not have to waste Wifi (how ever little) battery between the 2 devices. Questions - Is it possible to get internet via USB on the android stick ? - Can it get power from the USB too ? - Will starting the car have bad effects on these devices ?