Cell balancing is essential to prolonging the life of batteries and protecting battery cells to guarantee the safe and dependable functioning of LiFePo4 batteries on electric vehicles. Passive cell balancing is frequently employed in BMS because it is affordable and easy to implement. To eliminate the excess charge in the battery, resistors are used as the balancing component in the passive cell balancing procedure. Small battery resistors are quite effective but large-capacity batteries require bulk resistors even though it is ineffective. The MOSFET internal resistance serves as an effective balancing element to achieve cell balancing. By using the internal resistance of the MOSFET, the requirement of additional balancing components is avoided. The current through the resistance is minimized; thus, the power losses are minimized, and the heat dissipation is also reduced; thus, the battery pack temperature is also maintained in the nominal value which reduces the risk of battery degradation due to temperature.