AT&T's battery backup add-on provides a backup router with up to 24 hours of battery power to keep critical internet connections active during power outages. When your fiber connection is restored, internet service automatically reverts to its standard configuration. This is a critical complement to both Business Fiber and Internet Air for Business deployments - particularly for the WNC-CGW452 converged gateway, whose 5G failover feature requires mains power to operate. AT&T's 24-hour backup exceeds most competitors by 8 hours.