Abstract: In order to ensure effective functioning, the Batteries Management System (BMS) plays a crucial role in supervising and controlling the charging and discharge procedures of rechargeable battery packs within electric cars. Protection of the battery, preserving its dependability, and increasing its whole life are its fundamental goals. A range of monitoring methods, including as ambient temperature, voltage, and current monitoring, are used to maintain ideal battery conditions in order to do this. The use of microcontrollers in combination with analogue and digital sensors allows for efficient monitoring. In addition, this study investigates variables including battery maximum capacity, health condition, and charge state in an effort to offer thorough understandings of BMS features. Through the examination of these techniques, the research aims to anticipate and prepare for future difficulties related to BMS, while also addressing current concerns. An essential component of BMS functioning is evaluating the battery's state, involving factors like charge status, condition, and overall life status. The study provides a comprehensive analysis of state-of-the-art battery condition evaluation approaches, highlighting impending issues for BMS and offering workable solutions