Volvo 2013 S80 Owner's Manual page 222

05 Comfort and driving pleasure
Passenger compartment convenience
12-volt socket in the trunk*
Fold down the cover to access the electrical
socket.
05
NOTE
The 12-volt socket in the trunk provides
electrical current even when the ignition is
switched off. Using the socket while the
engine is not running will drain the battery.
*
220
Option/accessory, for more information, see Introduction.