Canon EOS R5 C User Manual page 735

3.
Connect the DC coupler to the AC adapter.
Securely connect the plug of the AC Adapter CA-946 (sold separately)
to the connector of the DC Coupler DR-E6C.
4.
Connect the power cord.
Connect the power cord to the AC adapter and insert the power plug
into a power outlet.
Caution
While the camera is on, do not connect or disconnect the power cord or connector,
and do not remove the battery magazine.
Avoid getting the DC coupler cord caught between the battery grip and battery
magazine.
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