Chinese startup is betting on battery swapping as a solution to power its electric vehicles.

Nio will build 400 battery-swapping stations along highways and 600 in urban areas with a focus on the country’s third- and fourth-tier cities and counties, Li said in a post on Nio’s social media platform on Tuesday.

The move marks an expansion of its plan in December of adding 400 such stations this year. Li found more of them are needed to improve user experience after his trips to northeastern China and lower-tier cities in Zhejiang, he added.

Battery swapping allows drivers to replace depleted packs quickly with fully charged ones, rather than plugging the vehicle into a charging point. Swapping could help mitigate the growing strains placed on power grids as millions of drivers juice up, yet specialists caution it can take off in a big way only if batteries become standardised industry-wide.

Nio is among the few EV makers that are betting on battery swapping as one of the major power solutions for electric cars. Rival Tesla had previously dismissed battery swapping as “riddled with problems and not suitable for widescale use”.