NIO Inc. (NYSE:NIO) shares are trading higher in the premarket session on Wednesday. According to Benzinga Pro, NIO stock has gained over 6% in the past month. Investors can gain exposure to the stock via KraneShares Electric Vehicles and Future Mobility Index ETF (NYSE:KARS) and Invesco Golden Dragon China ETF (NASDAQ:PGJ). Last month, the electric vehicle (EV) manufacturer increased the number of battery swap stations by 40 in China, as documented on the Nio App today, reported CnEV Post. This figure represents a significant rise from the 19 stations added in July, although it remains lower …