Power 30 homes with one car battery...

OK, I see they made panels with wasting water and chemicals.

I didn't see how they made a solar cell and how long they expect the cell to last.

If this is so efficient then why just not use raw materials?
 
MIT Explains How To Turn an Old Car Battery Into a Working Solar Cell

It's a pretty incredible project, not only from a technical perspective but a broader societal one. The world is about to have a major dilemma on its hands, if toxic car batteries are no longer recycled to make new car batteries. "Once the battery technology evolves, over 200 million lead-acid batteries will potentially be retired in the United States, and that could cause a lot of environmental issues," one researcher told MIT News.

This is a way to transfer the embodied value of one technology into a newer, more nascent one, and it's a solution to a problem that's going to rear its head again and again in the future. We'd do well to focus on figuring out other ways to funnel the other rare earth minerals, metals, and materials from our outgoing tech into the new. [MIT News]

That pretty well explains it.
 

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