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Grid-scale batteries: They’re not just lithium
(arstechnica.com)
This is a most excellent place for technology news and articles.
If you're not limited by space isn't lead-ion cheaper?
It is, but lead based chemistries tend to wear out and need replacing a lot sooner than lithium ion.
You’re core idea is correct though, there’s a lot of battery techs that are cheaper / better when size and weight are irrelevant.