Battery Backup Information for Optimum Phone Customers

Optimum Phone subscribers have the option to purchase a battery for their modem that provides eight (8) hours of backup power support. In the event of a power outage, the Optimum Phone service, including E-911 services, will not be available unless both the modem and telephone have its own power supply. For instance, a cordless phone that is electrically powered will not work during a power outage, even with battery backup for the modem. Additionally, if there are any disruptions to the Optimum network or facilities, the Optimum Phone service will not work.


Batteries are designed to provide 8 hours of power support to the modem. The estimated service life of the battery is 6 to 10 years. Batteries should be stored in a cool, dry place.


Please note, Optimum does not provide monitoring of battery function. Subscribers are advised to perform routine monitoring of battery function by checking the LED indicator on the battery unit. If the LED indicator is blinking, the battery has hit low life threshold and replacement is necessary (but will still work for a limited period of time). If the LED indicator is out, the battery is either not present or dead.


Optimum Phone subscribers interested in purchasing a battery may visit to purchase and to find additional information regarding modem compatibility. Arris provides a 1 year warranty. For additional inquiries regarding shipment, warranty or requests for replacement, please contact Arris at:


Date Posted: August 1, 2022