Vehicles are machines driven on wheels to run on the road.
The vehicles include motor vehicles (general engine-driven cars) driven with mechanical power produced by burning oil fuel, such as gasoline and diesel after switching on the ignition using a battery, and eco-friendly vehicles driven by electrical power of a battery to reduce the amount of harmful fuel emissions and increase fuel efficiency.
The echo-friendly vehicles include electric vehicles having a rechargeable power unit comprised of a battery and a motor, rotating the motor with electricity charged in the battery, driving the wheels using the rotation of the motor, hybrid vehicles driven by having an engine, a battery, and a motor and controlling mechanical power of the engine and electrical power of the motor, and hydrogen fuel cell vehicles.
These vehicles include a battery for switching on the ignition or for switching on the ignition and supplying driving power, and the battery also supplies power to operate various devices equipped in the vehicle.
The battery is discharged due to the dark current flowing in various electronic devices in the vehicle while the vehicle is turned off, and the discharge amount increases with the passage of the turn-off time. The battery may not start up the vehicle when discharged below a reference level.