> There are numerous arguments about how we will always need coal power or nuclear power, or natural gas and they all base it on old studies with obsolete high costs of batteries.

This is simply not true. I'm sure there are some bad articles out there but that's true for anything.

See e.g. https://www.cell.com/joule/pdf/S2542-4351(18)30386-6.pdf where they authors find non-intermittent power production to be necessary even under an assumption of a further 75% drop (from 2018 levels) in battery prices.