Every day, Wang Bing drives his big electric lorry to send about five tonnes of goods between the cities of Haikou and Dongfang on Hainan, a tropical island in southern China. A round trip covers about 500 kilometres (310 miles). But refuelling is not something Wang worries about.
"When my battery runs low, I just drive my truck into a battery-swapping station to get a fully charged one," says the 53-year-old, who shares the journey with a colleague in eight-hour shifts.
