BYD, the Chinese electric vehicle (EV) giant, has become a competitor to Tesla with its diverse range of products.Apart from manufacturing cheap EVs, BYD also produces batteries, buses, trains, iPhones, and iPads.BYD's manufacturing expertise allows it to make most of the components in-house, helping it expand rapidly in the Chinese EV industry.BYD's side hustles include assembling Apple products, battery production, energy storage, manufacturing buses, and building monorail systems.