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Installing a Battery Backup for a DOCSIS 3.1 Internet and Telephone Modem


Technicolor CGM4141 Panoramic WiFi Modems that are operating on a battery backup will not automatically recognize when AC power has been restored. The modem must be manually restarted to operate on AC power after a power outage.

Use the following steps to install your battery backup for your DOCSIS 3.1 Panoramic WiFi Modem, the Technicolor CGM4141, and the Arris TM3402.

Note: To see how to install a battery for other modems, see Installing Telephone Modem Battery.


Unplug the power cord from the electrical outlet, and then unplug the power cord from the back of your modem.

image of unplugging the power cord from the modem and outlet

Note: Your service is briefly interrupted.


Plug your modem power cord into the back of the battery backup, and then plug the other end into the electrical outlet.

image of plugging modem power cord into backup and electrical outlet


Plug the battery backup's power cord in to your modem's power port.

image of plugging battery backup power cord to the modem

Result: For the Technicolor CGM4141, the battery backup LED blinks green.


Wait for the battery backup to be fully charged.

  • The Technicolor CGM4141 is fully charged after it charges for about 20 minutes. The battery backup makes a beeping sound and the LED light turns solid blue when it's ready for use.
  • The Arris TM3402 battery LED is green when it's ready for use.

    image of the battery backup with a blue LED light

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