The New CBR001-T Replacement Battery is the ideal power solution to keep your Comcast Xfinity modem running during unexpected power outages. Designed as a direct replacement for the Inventus CBR001-T (Part Number: 34336), this high-capacity 7.4V 7800mAh Lithium-Ion battery ensures that your Xfinity Voice service and internet connection remain uninterrupted when you need them most .