Batteries are becoming more and more popular for use in homes and cars, which uses because of their high efficiency, minimal self-discharge, and high volumetric and gravimetric energy densities. However, because they can carry a lot of energy, Failure to confirm that they are functioning within their allowed safe operating limitations could result in fire dangers and explosions because they tend to be more unstable than other power sources, such as lead-acid batteries. To maintain battery packs within safe operating parameters & optimum power usage, innovative Battery Management Systems (BMS) are required, hence avoiding endangering users. This inquiry starts with a battery model employing passive components before addressing the crucial components of developing a successful BMS. Additionally, it offers simulation to make a BMS’s operation easier to understand.