In case your ONT Power Supply Unit is accidentally unplugged - or in the event of a commercial power failure - a BBU is installed to provide you with backup power for standard voice service (but not Voice-Over-IP services) for approximately eight hours.
 | Model types of the Battery Backup Unit |
The BBU is installed at your location in an area where it can be easily monitored - most likely near the ONT Power Supply Unit (OPSU). The BBU is connected directly to the ONT to provide backup power if it's needed. In addition, the BBU contains a series of indicator lights that tell you whether your service is being powered by your location's electricity or the battery.
The BBU also indicates when the backup battery needs to be replaced.
How do I get a replacement battery?
You battery is under warranty for one year. How long you've had your battery generally determines how to best get a replacement battery. Follow the guidelines here.
Important:
The Verizon supplied battery is designed specifically for use with the Verizon FiOS Network. Use of a battery other than a 12-Volt 7.2 Ah SLA Sealed Lead Acid Battery is not recommended since other battery types may impact the performance of your FiOS services. Verizon is not responsible for damages which result from use of an improper battery.
How do I properly dispose of my old battery?
Battery disposal standards and requirements vary by state. If you need to replace the sealed lead-acid battery in your backup unit, please check with the following Environmental Protection Agency (EPA) resources for proper disposal instructions:
Visit www.epa.gov/osw or call the EPA directly at 1-202-272-0167