The 900V high voltage of the NIO ET9 may spark discussion, but the wire controlled chassis is the real key. NIO is about to launch its flagship model, the ET9, at the NIO Day on December 23. Several executives have recently spoken out on social media about this new model, revealing some technical details in advance. Among them, NIO Senior Vice President Bi Lu stated on social media that the ET9 will be equipped with a 900V high-voltage fast charging system, which is further improved compared to the current mainstream high-voltage fast charging.