Have you experienced a power outage? If so, you need a backup power source to make emergency calls using your Xfinity Voice service. In the event of power outage, Xfinity’s backup power solution ensures your phone service remains available for up to 24 hours, provided that the network remains available.
Note: During a power outage, you must use a corded telephone or other device that doesn't rely on commercial power. Xfinity doesn't offer backup power solutions for customer-owned equipment.
Get an Xfinity Voice Battery Backup case
Xfinity Voice service won't operate during a power failure without a backup power source. An Xfinity Voice Battery Backup case for certain rental modems can be purchased from Xfinity at any time and is currently priced at $65 (plus tax and shipping).
The Xfinity Voice Battery Backup case requires six 6-volt lantern batteries that must be purchased separately from retailers. Properly installed, the batteries provide 24 hours of backup power for Xfinity Voice service, provided that the network remains available.
The Xfinity Voice Battery Backup case comes with a one-year warranty and self-monitoring features (indicator light and audible alerts) to help you determine when to replace your batteries.
Batteries can't be installed or replaced during a power failure. Xfinity has tested specific battery brands to ensure battery life. Recommended brands are Rayovac and Energizer.
New Xfinity Voice customers
New Xfinity Voice customers can purchase an Xfinity Voice Battery Backup case when they order Xfinity Voice service.
The Xfinity Voice Battery Backup case requires six 6-volt lantern batteries, which aren't included but are available for purchase from retailers.
Existing Xfinity Voice customers
If you already have Xfinity Voice service and would like to order an Xfinity Voice Battery Backup case, please call us at 1-888-972-1261. The case is shipped to your home within five to seven business days. A shipping and handling fee applies.
The Xfinity Voice Battery Backup case requires six 6-volt lantern batteries, which are not included, but are available for purchase from retailers.
Comcast Business Voice customers
If you are a Comcast Business Voice customer, please call 1-800-391-3000 for details about the Comcast Business Voice battery replacement program.
Learn more about detailed instructions on how to install the battery in your Comcast Business Voice modem or wireless gateway.
Xfinity Voice Battery Backup case limited warranty
The Xfinity Voice Battery Backup case comes with a one-year warranty.
See more information regarding the Xfinity Voice Battery Backup case limited warranty.
Battery monitoring
The Xfinity Voice Battery Backup case comes with self-monitoring features, including an indicator light and audible alerts (indicating batteries are depleted and should be replaced), to help you determine when to replace your batteries.
Xfinity recommends specific brands of 6-volt lantern batteries to ensure battery life, which can be purchased from retailers. Batteries can't be installed or replaced during a power failure.
| Event | Visual | Audio |
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| Commercial power lost |
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| Commercial power restored (after power failure) |
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| Low voltage threshold met |
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Xfinity Voice uses electrical power in your home. If there is an electrical power outage, 911 calls and other calls may be interrupted if a backup power source isn't installed, fails, or is exhausted after several hours.
Furthermore, calls, including calls to 911/E911, may not be completed if there's a problem with network facilities including network congestion, network, equipment, or power failure, or another technical problem. It's also important to note if there's an electrical power outage and a backup power source is installed for your Xfinity Voice modem, only the primary phone number will work.