The rate of electrically or semi-electrically powered vehicles is growing worldwide. Already today a large part of all the trips taken in Germany could be made with an electric drive. However, for the e-car to be suitable for daily use and the mass market, batteries will have to become lighter and cheaper. May's edition of VIAVISION gives you an overview of the latest state of the art and the current challenges in battery technology, explains how lithium-ion batteries work and tells you about the world's lithium reserves. Also: China in numbers - facts about the automotive industry of the world's largest car producer.