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Electric vehicles are becoming more and more common, but this green transportation method is facing the problems like: inconvenient charging process, fire, short battery life. The EcoEasy-Auto system solve this by automatical car battery replacement. It use solar power to charge batteries which are stored underground for safety. The underground temperature is warm in winter and cool in summer to extend the life of the battery in an environmentally friendly way. Rotary replacement design gives you a Formula 1 racing-like efficient replacement experience. EcoEasy-Auto will improve the using experience and help to build sustainable cities.