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[Home](https://www.att.com/) 2. [Support](https://www.att.com/support/) 3. [Digital phone](https://www.att.com/support/u-verse-voice/) # Learn about battery backups Have our traditional home phone over AT&T Fiber or digital phone service? Use a battery backup system to keep your phone working during a power outage. * * * OverviewOverviewWi-Fi gatewaysWi-Fi gatewaysONTONT A battery backup system keeps your phone working during a power outage. That way, you can still call 911 and maintain home alarms or medical alert services for short periods of time. It’s important to remember: - Each piece of equipment used to provide voice service to your home needs its own battery backup. You may need backups for: - Wi-Fi® gateways - Modems - Optical network terminal (ONT) devices - Many cordless phones require power to make calls. Test yours before an outage to see if it will work without power. During a power outage, make sure you limit your use to emergency calls only. How long your backup will last depends on your equipment and how long you talk on the phone. Other AT&T services (such as U-verse® TV or AT&T Internet) will quickly drain your stored power. ### Equipment details for 24-hour backup The right battery backup depends on the type of phone service you have. Review the options for your Wi-Fi gateway and ONT (if needed). We show how you can purchase a 24-hour battery backup, but you have a choice. You can also buy a backup option that lasts for less time. A single PSI Battery Kit can power your Wi-Fi gateway for up to four hours or more. Remember, if you have an external ONT, it requires a separate backup power source. Not sure what equipment you have? Call us at [__800.288.2020__](tel:%20800.288.2020) for help. __Important:__ If you have medical or safety power needs, we suggest you choose a battery that offers up to 24 hours of backup time. ### Single family homes If you live in a single-family home, check your equipment. If you have a: - Wi-Fi gateway only: Review the Wi-Fi gateway tab to get back up details - Wi-Fi gateway and ONT: Review the Wi-Fi gateway tab to get backup details and call us to get the ONT info ### Apartments & condos If you live in an apartment, condo, townhouse, or duplex, there may be different requirements for your battery backup. Here’s how to find what you need: [Review this building and community list](https://www.att.com/ecms/dam/att/consumer/help/pdf/Apartments-MUD-NotCompliant.pdf "PDF opens in new window") If your complex: - Is on the list, [learn more about your building.](https://www.att.com/support/article/u-verse-voice/KM1076505/ "Link opens in same window") - Isn’t on the list, check your equipment. - Wi-Fi gateway only: Review the __Wi-Fi gateway__ tab to get back up details - Wi-Fi gateway and ONT: review the __Wi-Fi gateway__ tab to get backup details and call us to get the ONT info - Wi-Fi gateway and modem: Review the __Equipment type__ for your modem to get back up details ### Details If you have AT&T Phone provided over copper or fiber, you’ll need backup power for your Wi-Fi® gateway. You may have a BGW620, BGW320, BGW210, Pace 5268, NVG599, NVG589, or others (model located on the gateway). ### BGW620: Fixed Fiber Port BGW620s with a Fixed Fiber Port connect with a fiber jumper inserted into the fiber port at the bottom of your gateway.  __4-hour gateway backup (low-cost solution):__ [PSI Low-cost Battery backup kit](https://www.powertecsolutions.net/li-75-battery/ "Link opens in new window") __24-hour gateway backup:__ [PSI 24-Hour Li-75 Battery Kit](https://www.powertecsolutions.net/li-75-battery/ "Link opens in new window") __Cost for 24-hour backup:__ Around $450 __Setup guide:__ [PSI Battery Backup Guide (PDF, 108KB)](https://www.att.com/scmsassets/support/articles/psi_battery_backup_setup_and_troubleshooting.pdf "PDF opens in new window") ### BGW620 or BGW320: internal ONT BGW620s or BGW320s with an internal ONT connect with a fiber bridge inserted into the SFP port at the bottom of your gateway. __Note:__ Due to the high power consumption of the BGW620 with an SFP, an additional set of batteries is required to power the gateway for 24 hours.  __4-hour gateway backup (low-cost solution):__ [PSI Low-cost Battery backup kit](https://www.powertecsolutions.net/li-75-battery/ "Link opens in new window") __24-hour gateway backup:__ [PSI 24-Hour Li-75 Battery Kit](https://www.powertecsolutions.net/li-75-battery/ "Link opens in new window") __Cost for 24-hour backup:__ Around $450 for BGW320, $700 for BGW620 __Setup guide:__ [PSI Battery Backup Guide (PDF, 108KB)](https://www.att.com/scmsassets/support/articles/psi_battery_backup_setup_and_troubleshooting.pdf "PDF opens in new window") ### BGW620 or BGW320: external ONT BGW620s and BGW320s with an external ONT connect with an Ethernet cable in the top, red ONT port. These gateways will require a battery backup for both your gateway and your ONT.  __4-hour gateway backup (low-cost solution):__ [PSI Low-cost Battery backup kit](https://www.powertecsolutions.net/li-75-battery/ "Link opens in new window") __24-hour gateway backup:__ [PSI 24-Hour LI-75 Battery Kit](https://www.powertecsolutions.net/li-75-battery/ "Link opens in new window") __Cost for 24-hour backup:__ Around $450 __Setup guide:__ [PSI Battery Backup Guide (PDF, 108KB)](https://www.att.com/scmsassets/support/articles/psi_battery_backup_setup_and_troubleshooting.pdf "PDF opens in new window") __ONT backup:__ Contact us at [__800.288.2020__](tel:%20800.288.2020) to determine the correct backup solution for your External ONT. ### Older gateways The BGW210, Pace 5268, NVG599, NVG589 and other models require backup for the  gateway (and an external ONT if you have Fiber service).  __4-hour gateway backup (low-cost solution):__ [PSI Low-Cost Battery backup kit](https://www.powertecsolutions.net/li-75-battery/ "Link opens in new window") __24-hour gateway backup:__ [PSI 24-Hour Li-75 Battery Kit](https://www.powertecsolutions.net/li-75-battery/ "Link opens in new window") __Cost for 24-hour backup:__ Around $450 __Setup guide:__ [PSI Battery Backup Guide (PDF, 108KB)](https://www.att.com/scmsassets/support/articles/psi_battery_backup_setup_and_troubleshooting.pdf "Link opens in new window") __ONT backup:__ Contact us at [__800.288.2020__](tel:%20800.288.2020) to determine the correct backup solution for your external ONT, if you have Fiber. If you have AT&T Fiber, AT&T Internet, or AT&T Phone, you may have an Optical Network Terminal (ONT). They are often located on the side of your house, in your garage, or on an inside wall. To make sure you have the correct battery backup for your ONT, contact us at [__800.288.2020__](tel:%20800.288.2020). We’ll help identify what equipment you have and let you know what backup you need. Some backups you can install yourself. Others require a tech to install (charges apply). __Important:__ Installing the wrong battery backup for an ONT could damage it. ### Nokia 010 and Nokia 020 – indoor ONT  __Backup:__ [D-cell battery backup kit](https://www.att.com/accessories/specialty-items/nokia-cyberpower-d-cell-battery-backup-solution.html#sku=sku9420277 "Link opens in new window") (requires 12 D-cell batteries, not included). __Setup guide:__ [D-Cell battery Backup Guide (PDF, 100KB)](https://www.att.com/scmsassets/support/articles/dcell_battery_backup_setup_and_troubleshooting.pdf "PDF opens in new window") ### Nokia 210/240 ONT – outdoor ONT  __Backup kit:__ Select the battery kit identified for your ONT type. You only need one. - [D-cell battery backup kit](https://www.att.com/accessories/specialty-items/nokia-cyberpower-d-cell-battery-backup-solution.html#sku=sku9420277 "Link opens in new window") (requires 12 D-cell batteries, not included). Once you get the kit, call the toll-free number we gave you to schedule a tech install (charges apply). D-cell battery backup kit for $79.99 - [GT12080-HG extended power kit from GS Battery](https://gsbatteryonlinestore.gsbattery.com/products/goldtop-extended-power-kit "Link opens in new window"). Be sure to check out the installation instructions inside the kit. __Good to know:__ Have multiple phones lines? You may have more than one type of phone service to back up. Call us to get more info. ### Nokia 250 – outdoor ONT  __Backup:__ [D-cell battery backup kit](https://www.att.com/accessories/specialty-items/nokia-cyberpower-d-cell-battery-backup-solution.html#sku=sku9420277 "Link opens in new window") (requires 12 D-cell batteries, not included). Once you get the kit, call the toll-free number we gave you to schedule a tech install (charges apply) ### GemTek 126 – indoor ONT  __Backup:__ [3 Tier PSI battery backup](https://www.powertecsolutions.net/li-75-battery/ "Link opens in new window") (includes 1 power supply unit with 3 PSI stackable batteries) __Setup guide:__ [3 Tier PSI Battery Backup Guide – Indoor (PDF, 113KB)](https://www.att.com/scmsassets/support/articles/psi_battery_backup_indoor_gemtek_setup_and_troubleshooting.pdf "PDF opens in new window") ### GemTek 126 – outdoor ONT  __Backup:__ [3 Tier PSI battery backup](https://www.powertecsolutions.net/li-75-battery/ "Link opens in new window") (includes 1 power supply unit with 3 PSI stackable batteries) __Setup guide:__ [3 Tier PSI Battery Backup Guide – Outdoor (PDF, 83.4KB)](https://www.att.com/scmsassets/support/articles/psi_batterybackup_outdoor_gemtek_setup_and_troubleshooting.pdf "PDF opens in new window") * * * ## SERVICE TYPE [Expand All](https://www.att.com) * * * Multi-dwelling unit with G.Fast service with Arris modem Your battery backup will power both your gateway and modem, if the modem is powered by a USB connection from the gateway.  __4-hour backup (low-cost solution):__ [PSI Low-cost Battery backup kit](https://www.powertecsolutions.net/li-75-battery/ "Link opens in new window") __24-hour backup:__ [PSI 24-Hour Li-75 Battery Kit](https://www.powertecsolutions.net/li-75-battery/ "Link opens in new window") __Cost for 24-hour backup:__ Around $450 __Setup guide :__ [PSI Battery Backup Guide (PDF, 85KB)](https://www.att.com/scmsassets/support/articles/psi_battery_backup_setup_and_troubleshooting.pdf "PDF opens in new window") Multi-dwelling unit with G.Fast service with Nokia modem You’ll have to purchase a battery backup for both your gateway and your modem.  __What to buy for your gateway:__ [PSI 24-Hour Li-75 Battery Kit](https://www.powertecsolutions.net/li-75-battery/ "Link opens in new window") __What to buy for your modem:__ - [APC Smart UPS-X 120V for your network termination equipment (NTE)](https://www.apc.com/us/en/product/SMX750C/apc-smartups-x-line-interactive-750va-rack-tower-convertible-2u-120v-8x-515r-nema-smartconnect-port-extended-runtime/ "Link opens in new window") - [APC Smart UPS-X battery pack for your network termination equipment (NTE)](https://www.apc.com/us/en/product/SMX48RMBP2U/apc-smartups-xseries-external-battery-pack-rack-tower-48v-864vah-rackmount-2u/ "Link opens in new window") __Cost for 24-hour backup:__ Around $2000 __Setup guides:__ - [PSI Battery Backup Guide (PDF, 85KB)](https://www.att.com/scmsassets/support/articles/psi_battery_backup_setup_and_troubleshooting.pdf "PDF opens in new window") - [APC Battery Backup Guide (PDF, 90KB)](https://www.att.com/scmsassets/support/articles/apc_battery_backup_setup_and_troubleshooting.pdf "PDF opens in new window") AT&T Phone – Advanced  __Equipment type used:__ AT&T Phone – Advanced VAB-01, which includes an internal 24-hour battery backup __How to get replacement battery:__ To replace your internal battery, call us at __844.357.4784__. To access the battery, insert two quarters into the slots on the bottom of the device and turn them counterclockwise. __Cost for replacement:__ Around $90 Intelligent Network Interface Device (iNID) transport service  __Equipment type used:__ iNID gateway and separate power unit __How to get battery backup:__ The iNID service only supports 4-hour battery backup service. If you want 24-hour battery backup, call us at __800.288.2020__ and request a tech to upgrade your AT&T iNID with a replacement service. Then, come back and find the right solution for your upgraded service. __Cost for 24-hour backup:__ Varies   * * * Last updated: May 16, 2025 * * * ## Browse topics Installation & setup Plans & rewards Troubleshooting Voicemail & features Explore options for getting your digital phone service up and running. Order status Professional installation Self-installation ### Did you get the help you needed? 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