It is possible to monitor and regulate the charging and draining of rechargeable batteries in electric cars using battery management systems (BMS). When it comes to the battery, a management system ensures it is safe and dependable while also increasing its lifespan. In order to keep the battery, voltage, current and ambient temperature in a stable condition, a variety of monitoring approaches are used. A variety of analogue and digital sensors with microcontrollers are used to monitor the environment. The maximum battery capacity, battery health, and battery charge are all discussed in this study. For future issues and answers, a reassessment of all these techniques is necessary.