cyberdome wrote:as far as I remember, you only have to return the STB and the router. The ONT and BBU stays.
You're correct.
For the ONT and Battery Backup Unit, they can be safely unplugged from mains power (unplug the battery, too!) if service is not going to be running off of there. Just be sure to re-connect both the Battery and Mains power before leaving a home or requesting service again.