Chinese Tesla rival Nio has developed an EV battery with a range of 1,000 km. Its CEO tested it out by driving for 14 hours on a single charge between two Chinese cities.

Nio CEO William Li, who has gained a reputation as China’s Elon Musk, live-streamed his mammoth 1,044km journey from Shanghai to Xiamen on December 17 in a test of the Chinese EV company’s groundbreaking battery technology.

Li said in in a post on the Chinese social media site Weibo that his Nio ET7 electric car was able to travel the whole 14-hour journey without recharging despite a regional cold snap and that he ended the 1000 km road trip with 3% battery charge still remaining.

The ET7 was powered by Nio’s 150 kWh battery, which Li says has the highest energy density of any mass-produced EV battery on the planet, allowing it to provide greater range than most other electric cars.