TOKYO -- Panasonic is beginning to reassess its relationship with U.S. automaker Tesla and its freewheeling CEO, Elon Musk.
Tesla chief now seen as risk to Japanese company's battery business

Panasonic President Kazuhiro Tsuga, right, and Tesla CEO Elon Musk have built mutual trust through their companies' car battery partnership.
TOKYO -- Panasonic is beginning to reassess its relationship with U.S. automaker Tesla and its freewheeling CEO, Elon Musk.