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FiOS Internet

Battery Backup Unit Closed
Battery Backup Unit Open
The Verizon Optical Network Terminal (ONT) includes a Battery Backup Unit (BBU) feature. You may utilize this feature by maintaining an active battery in the BBU. With an active battery, the BBU will provide backup power for your basic FiOS voice services, including Emergency 911 dialing, for up to 8 hours in the event of a commercial power failure. You are responsible for purchasing and/or replacing the battery in the BBU. Much like you would need to replace the batteries in a portable radio from time to time, periodically the BBU battery must be replaced. Please note that a damaged or leaking battery may damage Verizon network equipment and should be removed and/or replaced immediately. Use the Verizon Troubleshooter to check the status of your battery and provide next steps as required.

Instructions for Installing the Verizon PowerReserve Voice Backup Device.

Verizon provides free replacement batteries only if: You may purchase batteries for the BBU at from a third party retail provider.


My battery is no longer under warranty and I am not currently enrolled in the Verizon Expert Care Device Protection Plan
The easiest way to purchase a replacement battery is to visit . Batteries may also be purchased from a third party vendor.

My battery is under warranty, how do I order a replacement?
ONT batteries purchased from Verizon have a 1-year limited warranty. You can order a replacement battery at no charge from your computer using In-Home Agent or by calling us at 1-800-VERIZON (1-800-837-4966). Learn more about In-Home Agent


How do I track the status of my delivery?
Once you place you order with Verizon, your battery usually arrives between 5 – 7 business days via UPS Ground®. If you place your order using In-Home Agent or Interactive Media Guide (IMG) you probably received a Verizon reference number that can be used to check the status of your delivery. To track your delivery:

  1. Go to
  2. On the TRACKING page, expand the TRACK BY REFERENCE section.
  3. In the SHIPMENT REFERENCE field, type the Verizon reference number and click the TRACK button.
(Some Verizon reference numbers take up to 24 hours before they are found on the UPS website.)



I am currently enrolled in the Verizon Expert Care Device Protection Plan
Verizon Expert Care Device Protection Plan subscribers can call 1-877-718-6716 to confirm coverage.


Can I buy a replacement BBU battery from outside sources?
The Verizon-supplied battery is designed specifically for use with FiOS service. You may also buy a 12-Volt 7.2Ah SLA (Sealed Lead Acid) battery from a third party retail provider for use with the BBU. The use of other battery types is strongly discouraged since they may negatively impact your service(s). Verizon is not responsible for any damages resulting from the use of an improper battery.



Why won’t Verizon come to my home and replace the battery in my Battery Backup Unit (BBU)?
Verizon does not generally make repair calls to replace the battery in your BBU since it's very easy to do on your own.


How do I install a new battery?

You will receive instructions on how to install your battery when your new battery is delivered or you can watch the video instructions.



IMPORTANT NOTE: Batteries need to be disposed of properly. Visit or call at 877-723-1297 for instructions.

See also: Checking the Battery Back-up Unit
Battery Backup Unit (BBU) Indicator Lights
Battery Backup Unit (BBU) Audible Alarms
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