This research presents the most efficient method for turning vehicles with internal combustion engines (IC engines) into electric vehicles (EVs). With an emphasis on reducing the environmental footprint and optimizing energy efficiency, our strategy includes cutting-edge technology in electric powertrain parts, power electronics, and battery storage systems. This paper assesses performance indicators by thoroughly analyzing the integration of new electric drivetrain components and the retrofitting of old ones, including motor starting and energy usage. To produce energy-efficient EVs, we suggest a supercapacitor bank and an effective battery cooling system. The recommended approach, Safety concerns, environmental advantages, and economic viability are also covered. The suggested approach shows promise in terms of lower production of greenhouse gases, increased range, and cost-effectiveness. The results provide an efficient way of battery cooling system and efficient use of battery storage by integrating a supercapacitor bank. The outcomes support the worldwide trend towards environmentally sound methods of transportation by providing important insights that will accelerate the widespread use of sustainable EVs.