Comcast’s eMTA backup battery. (Image: David Trebacz)

Comcast digital phone customers will no longer receive battery backup and monitoring service free of charge, according to a notification mailed to customers with their bills:

“Effective February 26, 2013, a battery backup and battery monitoring will no longer be provided free of charge. For existing XFINITY Voice customers with backup batteries, Comcast will continue to monitor your current battery at no charge; however, replacement batteries and their monitoring will no longer be provided free of charge. Backup batteries (which include monitoring) will be available for purchase.  Please call 1-888-972-1261 for pricing and details. XFINITY Voice uses the electrical power in your home. If you do not have a battery backup, you will not be able to use this service, including the ability to make emergency 911 calls, during an electrical power outage.”

Comcast customers leasing eMTA modems (which supply the cable company’s phone service) report that before the change batteries were included in the box. But not anymore, even though the packaging and accompanying literature still show the battery is included.

The lithium-ion battery keeps Comcast’s phone service working during power outages, but like other rechargeable batteries, it does eventually wear out. Now customers pay to replace them, even though the modem itself is leased to the customer.

Scott, a Comcast customer in Michigan, told Comcast he was unhappy with what seems like a petty cutback:

“I’m really miffed that they would now suddenly require customers to purchase a battery for a leased device,” Scott said.