Does my Home Phone modem (eMTA) have a backup battery? :

Your Time Warner Cable Home Phone modem (known as eMTA) is powered by plugging it into an electrical wall outlet. If you wish, you can purchase a backup battery after Home Phone is installed.

Please visit for additional information, including tips on how best to prepare for an electrical outage.


To verify that the backup battery you purchased is working, check the indicator light on the front of your modem.  If it is on then your battery is charged and operating properly.

To test your battery:

  • Unplug the modem power cord from the wall.
  • Verify that you have a dial tone on your TWC Home Phone.
  • If so, your battery is working.


Please visit our User Guides to access additional information.

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