The alarm can be silenced for 24 hours by pushing the blue button on the front of the power supply. The
Missing Battery status light will be green if no battery is connected to the power supply.
For more information see the owner’s manual: att.com/batterybackup.
CyberPower PSU:
There are status lights on the front right of the CyberPower PSU. Refer to the Replace Battery and
Missing Battery status lights. The Replace Battery status light will be red if the battery needs to be
replaced. An audible alarm will also sound, with two beeps every three minutes when the battery needs
to be replaced. While running on battery power, if the battery begins to run low, the alarm will beep four
times every two minutes. The alarm can be silenced for 24 hours by pushing and holding the blue button
on the front of the power supply for three seconds. The Missing Battery status light will be red if no
battery is connected to the power supply.
For more information see the owner’s manual: att.com/batterybackup.
Replacing the Battery
Open the door, carefully pull the battery off the shelf and remove the black and red wires. Connect the
black (-) and red (+) wires onto the new battery noting the proper battery polarity. Slide the new battery
onto the shelf and secure. Close the door.
NOTE #1: If you have AT&T U-verse services (voice, high speed Internet, and/or TV), you must also have
battery backup power for the Residential Gateway for your AT&T U-verse services to function during a
power outage. For Residential Gateway battery-replacement and recycling information contact BELKIN
at 866-539-5791 or www.belkin.com/gatewaybattery. For more information, please refer to your Feature
Guide and your Belkin® | Residential Gateway Battery Backup User Manual.
NOTE #2: If you have Internet Service, you must provide battery backup power for your computer, if you
would like to have access to the Internet during a power outage. For example, your computer could be
plugged into an Uninterruptible Power Source (UPS), available at certain home and electronics stores.
NOTE #3: If you have a monitored home alarm that uses AT&T voice or Internet service as the
communications pathway, your monitored home alarm will not function during a power outage without
battery backup power for your AT&T voice or Internet service, as applicable. (AT&T voice service requires
ONT battery backup power, and AT&T U-verse services, including AT&T U-verse voice service, requires
both ONT and Residential Gateway battery backup power to function during a power outage).
NOTE #4: The ONT battery backup will not power cordless phones, home alarm panels, or other
equipment, such as telecommunications devices used to assist customers with disabilities, that are
connected to the telephone line and require electricity from the customer’s premises.
NOTE #5: A new, fully charged ONT backup battery will provide four to eight hours of backup power.
Actual results will vary, depending, among other things, on battery age, usage patterns, and
environmental conditions, including temperature extremes and fluctuations. To conserve battery backup
power for emergency calls, you should not use Internet services, U-verse TV or make unnecessary voice
calls during a power outage.
If you have any additional questions, please call 1.800.ATT.2020 or 1.800.288.2020.
