The paper presents an IoT-based battery monitoring system for electric vehicles (EVs), emphasizing the importance of efficient battery management to ensure optimal performance, safety, and longevity. The system includes features such as current and voltage measurement, fire protection, battery status detection, and an LCD display. It addresses common issues like thermal runaway and overcharging by implementing advanced thermal management and control mechanisms. Key components include an Arduino microcontroller, power supply, memory, input/output pins, a cooling fan, an LCD display, a buzzer, a temperature and humidity sensor (DHT11), a GSM module, a voltage sensor, and a motor. The software, developed using the Arduino IDE, allows for programming and communication with the hardware. The system aims to enhance the safety and efficiency of EVs by providing precise and timely data on battery health and status. Future research could focus on improving the precision and reliability of battery monitoring systems.The paper presents an IoT-based battery monitoring system for electric vehicles (EVs), emphasizing the importance of efficient battery management to ensure optimal performance, safety, and longevity. The system includes features such as current and voltage measurement, fire protection, battery status detection, and an LCD display. It addresses common issues like thermal runaway and overcharging by implementing advanced thermal management and control mechanisms. Key components include an Arduino microcontroller, power supply, memory, input/output pins, a cooling fan, an LCD display, a buzzer, a temperature and humidity sensor (DHT11), a GSM module, a voltage sensor, and a motor. The software, developed using the Arduino IDE, allows for programming and communication with the hardware. The system aims to enhance the safety and efficiency of EVs by providing precise and timely data on battery health and status. Future research could focus on improving the precision and reliability of battery monitoring systems.