Abstract
Further progression in automotive technologies is likely to contribute to solving several environmental and energy preservation issues. The industry has quickly responded to this expectation and performed extensive research and development programs. Amongst those technologies under investigation, high expectations are raised to the Electric Vehicles. The EV is more flexible to the primary energy source while it features high energy efficiency and no exhaust emissions except for the emissions from power generation system, as well as contributions to reduced CO2 emission levels. Since the battery technology is the heart of the EV, the several issues and the entropy concept of battery development will be discussed.