BYD's vehicle sales fell by 30.1% in January from a year earlier, the fifth straight month of decline, as the Chinese electric vehicle maker navigates external uncertainties and tough competition at home. The automaker sold 210,051 vehicles globally last month, a stock market filing on Sunday showed. The export volume of new energy vehicle was at 100,482 units for the month of January. Its production was down 29.1%, extending a losing streak which began July last year. At home, BYD launched upgraded new versions of a number of plug-in hybrid models with long-range batteries last month, aiming to boost the appeal of its affordable hybrid models.