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This paper discusses different methods to enhance the efficiency and life of an electric vehicle. In hybrid type electric vehicle, batteries based on lithium-ion plays a major role and are very helpful. In enhancing battery life nanotechnology is playing a very important role. So in battery design the use of nanostructure materials are increasing. This paper describes different energy storage techniques, nanotechnology in lithium-ion (Li-oin) battery, configuration of parallel battery, battery charging. Super-capacitors are used to enhance the efficiency, life and performance of the battery.