The accessory power socket can be used when the ignition switch is in
ACCESSORY
or ON
*1.
Open the cover to use it.
NOTICE
Do not insert an automotive type cigarette lighter element: The power socket can overheat.
The accessory power socket is designed to supply power for 12 volt DC accessories that are rated 180 watts (15 amps) or less.
To prevent battery drain, use the power socket only when the engine is running.
Honda Civic Owners Manual. Battery
Checking the Battery
Check the battery terminals for corrosion
monthly.
If your vehicle's battery is disconnected or goes dead:
The audio system is disabled.
The clock* resets.
The navigation system* is disabled.
Canadian models only The immobilizer system needs to be
...