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See this;
https://www.xfinity.com/support/articles/getting-a-new-battery
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Just an FYI, the battery will only keep your phone service running, not the internet. If you want both running in event of a power outage, you'll need an Uninterruptible Power Supply. (UPS).
I have one of these on my XB6 gateway and my cordless phone base.
I am not a Comcast Employee.
I am a Customer Expert volunteering my time to help other customers here in the Forums.
We ask that you post publicly so people with similar questions may benefit from the conversation.
Was your question answered? Mark the post as Best Answer!
I am a Customer Expert volunteering my time to help other customers here in the Forums.
We ask that you post publicly so people with similar questions may benefit from the conversation.
Was your question answered? Mark the post as Best Answer!
I just got this modem myself, as a replacement, and want to get a battery. Thanks for the link to that xfinity support doc, @EG . It gives the price for the battery as $165! Ridiculous even for Comcast; might as well spring for a UPS. Especially since Arris lists the price as $60. If they had any in stock, which they don't. Wonder who bought 'em all. 
Your welcome ! Dead tread from last year now being closed.
I am not a Comcast Employee.
I am a Customer Expert volunteering my time to help other customers here in the Forums.
We ask that you post publicly so people with similar questions may benefit from the conversation.
Was your question answered? Mark the post as Best Answer!
I am a Customer Expert volunteering my time to help other customers here in the Forums.
We ask that you post publicly so people with similar questions may benefit from the conversation.
Was your question answered? Mark the post as Best Answer!
