Canon imageCLASS MF6500 Series Basic Manual page 164

If power is suddenly lost due to an outage or accidental unplugging, a built-in
battery retains the user data settings and the speed dialing settings. Any sent or
received documents stored in memory are backed up for about 60 minutes.
During a power cut, functions are limited as follows:
- You cannot send, receive, copy, scan, or print documents.
- You may not be able to make telephone calls using an external telephone,
depending on the type of telephone you use.
- You can receive telephone calls using an external telephone depending on the type
of telephone you use.
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