https://www.att.com/support/article/home-phone/KM1322642/
Replace your battery backup - AT&T Home phone Customer Support
Find out how to maintain or replace a battery in your current unit. Plus, learn how to store, test, or dispose of your battery.
replace your batteryhome phonebackupcustomersupport
https://www.att.com/support/article/u-verse-tv/KM1322642/
Replace your battery backup - AT&T U-verse TV Customer Support
Find out how to maintain or replace a battery in your current unit. Plus, learn how to store, test, or dispose of your battery.
at t u versereplace your batterybackup