An electric car is an automobile that is propelled by electric motor, using electrical energy stored in rechargeable batteries. The air pollution and global warming problems will be solved by an electric car, this is not new idea as a solution to the these problems. Electric cars have been used in the past, but gasoline car is more popular than electric car by the following reasons. For one thing, the price of an electric car is more expensive than a gasoline car. In addition, electric car is also a trouble of the distance and the battery has a to decadent over time. On the other hand, the cost of maintenance for electric car is cheaper than a gas-powered car. Besides, many companies corrected battery problem by battery-switching , a driver can switching a new battery at the battery switch station.