Battery backup units for Digital Home Phone

Your Digital Home Phone will not work in the event of a power outage unless you have a battery back-up. CenturyLink offers two different 24-hour battery backup units (BBU) for digital voice services. Please contact us to order a battery backup unit.

Electrical power is required for non-line-powered voice services (including Digital Home Phone) to work. If there is a power outage, the services will not process calls, including those to Emergency 911.

With active batteries, the BBU will provide temporary backup power during an outage, allowing basic voice services to keep functioning, including the ability to dial 911. Please note that in the event of an outage that impacts the service network as well, the BBU may not guarantee functionality.


You may purchase necessary battery backup solutions from CenturyLink, or you may get a BBU from another supplier and install it yourself. When you talk to a CenturyLink service agent, you can ask what battery or batteries you may need for your type of service.

Important information about BBU

In case of an electrical power outage, the CenturyLink BBU should last at least 24 hours in standby mode. While under BBU power, you may not be able to access the internet. Other services, such as security alarms, may not work.

You are responsible for obtaining, monitoring, replacing and properly disposing of all batteries for the BBU. We recommend that you check the BBU at least twice a year to ensure it is operating and ready to use in case of a power outage.

IMPORTANT: Failure to maintain your BBU may result in loss of voice service during a power outage, including a loss of access to Emergency 911 and other services.

If you purchased the BBU from CenturyLink, our warranty covers the replacement of the battery in the event it stops working within the first year.


More information regarding these units is available on the Precision Power Solutions site.


See batteries labeled:  PP36PB-GRST-2-24D and PP36PB-12BBU-2-24D


For technical assistance or warranty information, contact Precision Power at:
Phone: 615-436-0080

The battery backup units use D size, 1.5 volt, alkaline batteries.

Please note that the BBU is not covered by our Inside Wire Protection plan.

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