Consumers - T25: Internal Battery Backup Support
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T25: Internal Battery Backup Support

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Question
How do I add an internal battery backup to my T25 Cable Modem?
Answer
The T25 Cable Modem does not support an internal Lithium-Ion battery backup to provide continued voice service during power outages.  It is recommended to purchase an external UPS Battery Backup system to provide continued voice service during power outages.

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