in 21 march the battery pack of an outlander phev at a dealership in yokohama overheated and melted some of the battery cells, after the vehicle had been fully charged and stood for one day. nobody was injured in the incident. the battery packs are produced by gs yuasa, the same company that supplies the batteries for the boeing 787 dreamliner, whose entire fleet was grounded in january 2013 for battery problems. mitsubishi did not issue a recall but halted production and sales until it determined the cause of the battery problems. the carmaker advised the 4,000 owners of the outlander plug-in hybrid to drive only on gasoline mode for the time being. on 19 august 2013, after changing a production process to avoid damaging any batteries, mitsubishi restarted production of the outlander plug-in hybrid.