Battery technology is an extremely well developed field with already existing and currently under construction large production facilities. Battery degradation is also much less on an issue with stationary installations, both due to how they can distribute the load to avoid deep discharging and due to the fact that some drop in total capacity is less relevant. Furthermore, redox-flow batteries basically do not have this issue.
Its pointless to argue what-ifs, when renewables combined with grid level battery storage is the cheaper and more easily scalable solution. Nuclear is an outdated relic of the past, just let it die.