What if they don’t? There’s no assurances there will be magic battery tech
There is a reason China India Russia and others are still building nuclear plants
China is building nuclear because they are building everything, but they are effectively building 3x as much solar and 7x as much wind because nuclear just costs more than any other option.
From 2020-2022 China increased generation power by:
51,600 GWh/year Nuclear
156,600 GWh/year Solar
357,500 GWh/year Wind
Adding more capacity is an all hands on deck situation for the China they are throwing everything at it. Nuclear is simply achieving the smallest gains because the ROI is low.