Electric vehicles have high-voltage battery packs rated at over 200 volts to generate enough power to drive their motors. These high-voltage battery packs contain many low-voltage battery cells connected in series. The Battery Monitoring Unit monitors the voltage and temperature of the individual low-voltage battery cells. In other words, this unit constantly assesses the state of the battery cells. BMU detects a battery's voltage, current, temperature, and other parameters to enable high-voltage batteries to be used safely and efficiently.