How much do those batteries cost and can they supply power for multiple days or a season if your renewable sources aren't providing like normal?

Not to mention the environmental damage from producing and disposing of batteries.

They can’t supply power for more than a couple of day currently. And that’s not all. Battery tech is rapidly evolving-no one knows how to do it "right" yet, which means you might invest, e.g., 50 billion now for batteries that will be obsolete 5 years from now. Nobody wants to do that and I think that among other things is why we still don’t see batteries deployed at scale.

I agree, there are better options for mass scale long term energy storage than batteries, e.g. (green) hydrogen, methane

Pumped hydro is currently the cheapest long term energy storage by a significant amount.