From my understanding the USB ports are disabled, though I have not personally tried to use them either. Also should you decide to go this route, you’ll want to keep it 6ft or more away from the ST hub as wifi and zigbee use the same frequencies and having the two in close proximity can prevent zigbee devices from working consistently.
My Hub is right next to my wireless router right now. I have five connected zigbee devices with no issues. I know the USB port is disabled but it may still provide power. I guess I can just check if it charges my phone. =)
I use an older wireless router that was in the attic (Netgear 6300v2) in bridge mode to connect the hub via the ethernet port to the router. With a wireless router in bridge mode, I can place the V2 hub closer to my Z-Wave door locks and other contact and motion sensors.
The V2 hub is not a high performance wireless device and therefore performs acceptably on a router bridge.
I’ve actually done this, and it does work powered off the hub’s USB ports. Theya re powered at all times even if they dont do anything. When you go on battery backup things get a little glitchy due to voltage sag though. Replacing the cells that came with the hub with Energizer advanced Lithium ones solved that.
I don’t know about reliability longterm, but I used that exact model when I was going around setting up my v2 hub. It worked pretty well, and the USB port did provide power for it, even on battery power. Hope that helps!