Have you experienced a power outage? If so, you will need a backup power source to make emergency calls using your Xfinity Voice service. In the event of power outage, Comcast’s backup power solution will ensure 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 does not rely on commercial power. Comcast does not offer backup power solutions for customer-owned equipment.
Get an Xfinity Voice Battery Backup case
Xfinity Voice service will not operate during a power failure without a backup power source. An Xfinity Voice Battery Backup case for certain Comcast-provided modems can be purchased from Comcast at any time and is currently priced at $65, plus tax and shipping.
The Xfinity Voice Battery Backup case requires six eligible 6V lantern batteries that must be purchased separately from retailers. Properly installed, the batteries will 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 cannot be installed or replaced during a power failure. Comcast 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.
Note: The Xfinity Voice Battery Backup case requires six 6-volt lantern batteries, which are not 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 will be shipped to your home within five to seven business days. A shipping and handling fee will apply.
Note: 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, to help you determine when to replace your batteries.
Comcast recommends specific brands of 6V lantern batteries to ensure battery life, which can be purchased from retailers. Batteries cannot be installed or replaced during a power failure.
| Event | Visual | Audio |
| Activation |
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| Normal Operation |
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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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*Indicator that batteries are depleted and should be replaced.
Note: 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 is not installed, fails or is exhausted after several hours.
Furthermore, calls, including calls to 911/E911, may not be completed if there is a problem with network facilities including network congestion, network/equipment/power failure, or another technical problem. It is also important to note that if there is an electrical power outage and a backup power source is installed for your Xfinity Voice modem, only the primary phone number will work.
