The present invention is designed so that current consumption of the car battery does not occur when the car's key is removed from the car, but the car key is removed with the tail light or the interior light on, Electric power products suitable for the hobby or car club member's concept, or when the car fuel saving device, speaker amplifier booster, front sensor, etc. are directly connected to the car power supply, the electric power consumption is small even when the car key is removed. Even when the car is not used for a long time, the battery of the car is discharged and the engine does not start and the driver is deprived. Therefore, the main purpose of protecting the battery is to protect the battery. To come up with a system;The system for protecting the automotive power battery of the present invention is the DETECTOR part which detects that the vehicle is in the standby / charged state by separating the car key by connecting the system directly to the power battery of the vehicle as one module.;Reset unit for enabling the CPU to operate, CPU unit for controlling all operations of the system Selector unit for use with automotive power supply (DC12V / DC24V) Constant voltage circuit unit for supplying constant voltage to the CPU and peripheral circuits Power input unit, relay It consists of a control unit, a relay unit that manages the power ON / OFF, and a power output unit.
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