By Jesus Calero (Reuters) -Global sales of fully electric and plug-in hybrid vehicles rose 26% in September from a year ago to a record 2.1 million units, driven by strong demand in China and a late U.S. tax-credit rush, market research firm Rho Motion said on Wednesday. China accounted for about two-thirds of global sales with about 1.3 million units, while North America also hit a record as U.S. buyers moved to secure incentives before they expired, said Rho Motion data manager Charles Lester. WHY IT' ...