Porsche Hybrid Car and Porsche Green Automotive News! Axeon, Europe’s largest independent lithium-ion battery system supplier, is pleased to announce Axeon powers new RUF sports car . … largest independent lithium-ion battery system supplier, is pleased to announce that its advanced propulsion battery technology is at the heart of the world’s first electrically-powered German sports car , a development unveiled on Friday by RUF Automobile GmbH to European investors. …