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Environmental consciousness is being developed in each and every sector, automotive industry has concentrated in a greater manner. Reduction of tail pipe emission was concentrated and found that hybridization can ensure better results. Hybrid electric vehicle operates on electric motor as well as internal combustion engine. Battery power is one the major source of energy for driving electric motor and different battery technologies have been developed. Battery management system (BMS) controls battery parameters like State of Charge (SoC), State of Health (SoH) and Depth of Discharge (DoD) which definitely has an impact on power-torque ratings. Various drive train configurations are developed based on the power-torque requirements and size of engine/electric motor. Maintaining proper flow of energy can have better reduction in emissions, more battery life, less fuel consumption and optimum power-torque ratings.