Xfinity XBBL Battery Backup Device For Xfinity Modem
No Batteries included.
Uses 6-6volt batteries.
Unused.
How it Works: The XBBL is an external plastic casing that connects directly to your Xfinity gateway. It operates strictly as a backup power supply for digital voice capabilities. [1, 2, 3, 4]
Battery Requirements: The physical case itself does not usually include batteries when ordered from Comcast. It requires six 6-volt alkaline lantern batteries to function. [1, 2]
Replacements: If your backup batteries drain or expire, you can purchase a bundle of six 6V replacement spring-terminal batteries through online vendors like the Battery Junction XBBL Pack. [1]