I figured it was interpreted that way. But it was a genuine question and I thought the question had merit on its own. I wouldn't think many would come to defen

I figured it was interpreted that way. But it was a genuine question and I thought the question had merit on its own. I wouldn't think many would come to defend batteries, that they are awful for the environment isn't a controversial idea. They do however enable things like electric cars and such, which arguably make them worthwhile. And there are also other applications for batteries, such as even out supply and demand in the grid. But that doesn't really require them to be that environmentally friendly themselves to make sense for the environment - since they might enable more solar power etc. But as energy storage for the sake of just storing it? It might be worthwhile for a household (perhaps mainly because selling the surplus electricity often isn't a good deal). And the economics might even be worthwhile on larger scale as well. But is it really environmentally friendly?