Volvo 2008 V70 Owner's Manual page 177

12-volt sockets
The electrical socket can be used for 12-volt accessories such as cell phone chargers and coolers. The maximum
current is 10 A. For the socket to supply current, the ignition must be in at least mode I, see page 80.
WARNING
Always keep the sockets covered when not in use.
189
04 Comfort and driving pleasure
Passenger compartment convenience
12-volt socket in the cargo area (option)
Fold down the cover to access the electrical socket. It works whether or not the ignition is switched on. Use the
electrical socket with the engine running to avoid draining the battery.