FILE PHOTO: A Nio ES8 electric SUV changing its battery is seen inside a power station at a JAC Motors-NIO plant in Hefei, Anhui province, China December 14, 2018. Picture taken December 14, 2018. REUTERS/Yilei Sun
FILE PHOTO: A Nio ES8 electric SUV changing its battery is seen inside a power station at a JAC Motors-NIO plant in Hefei, Anhui province, China December 14, 2018. Picture taken December 14, 2018. REUTERS/Yilei Sun