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FiOS Internet

For more information on Back Up power, please take a look at the Verizon equipment that was installed in your home and select the appropriate picture below.

How do I Order, Replace and Dispose of my Battery Backup Unit (BBU) battery?

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



How do I setup and use my Verizon Power Adaptor and PowerReserve

Your Verizon FiOS voice service needs power to work. The type of Optical Network Terminal (ONT) you have is powered by a Power Adaptor. If you want back up power in case of a power outage, your ONT can be equipped with a Voice Backup PowerReserve device.



Power Adaptor
Image of Power Adaptor


What is a PowerReserve Device?
If your ONT is configured with a Power Adaptor, you may utilize the Verizon Voice Backup PowerReserve device which provides backup power for your basic voice services, including Emergency 911 dialing, for up to 25 hours in the event of a power failure. Please note that you may be responsible for purchasing the PowerReserve device and the initial set of 12 D-cell batteries, as well as being responsible for purchasing any replacement batteries.


The PowerReserve device can only be purchased from Verizon; however, D-Cell batteries may be purchased from a variety of retailers.


PowerReserve Device
Image of PowerReserve Device


How do I install my PowerReserve Tray?
The PowerReserve device is easy to install and can be mounted on the wall, if desired. Please follow the Power Reserve Installation Instructions here (pdf format) or use the online instructions below.

How do I order a replacement PowerReserve Tray that is under warranty?
If your PowerReserve device is not functioning properly and it is still under warranty (within 1 year of purchase), you can order a replacement at no cost by calling us at 1-800 Verizon (1-800-837-4966).

How do I order a replacement PowerReserve Tray that is out of warranty?
If your PowerReserve device is not functioning properly or has been damaged and it is out of warranty, you may purchase a replacement by calling us at 1-800 Verizon (1-800-837-4966).

I have FiOS service; can I get a PowerReserve?
The PowerReserve device will only power voice services, and is only available for use with certain types of Verizon equipment.

How do I know if my batteries are working?
Using the Battery Test strip included with your PowerReserve device, remove and test each battery and replace any batteries that failed the test.

Where do I get new batteries?
You are responsible for purchasing any replacement batteries.

How to install PowerReserve device
(You can download these instructions in pdf format here.)

  1. Power Reserve Case OpenedOpen the PowerReserve door by pressing the latched tab toward the unit and then pushing the tab up.

  2. The PowerReserve device can be laid flat or mounted to a wall.

  3. Uncoil the cable located in the center of the tray.

  4. Power Reserve Case Switch and wire coilInsert 12 new D-cell alkaline batteries into the device. DO NOT use rechargeable or Lithium batteries.

  5. Place the power switch to the OFF position.

  6. Plug the power cable into the power adapter.

  7. Close the PowerReerve door.

  8. Leave the unit OFF until needed during a commercial power outage.

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