The Chinese electric car company is seeing renewed market interest. But there are some things to know before buying.Chinese electric vehicle (EV) maker Nio (NIO 6.09%) has been a pretty terrible investment over the medium term. Share prices are down more than 85% over the last five years.However, Nio's share price recently started showing signs of life. It's up 37% year to date:NYSE : NIONioToday's Change( -6.09 %) $-0.35Current Price$ 5.40Key Data PointsMarket Cap$10BDay's Range$ 5.38 - $5.8752wk Range$ ...