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As another comment explains, it is merely getting back some of the energy expended in extracting metallic zinc and copper from their ores.

Also such potato batteries have been a school science projects for long.

I'm not defending potato batteries, I'm just pointing out that the article already explains all of this.

... as would a bucket of salt water. Or piss.

Yes, but the headline says it's a potato battery. It's not. It's a battery with a potato in it.

But that's what all potato batteries are.

That’s what they want you to think.

Lmao (if I delete this it’s bc I don’t like getting downvotes)

Nooo I can’t delete!!!!

That’s what they want you to think.

It is a potato battery—that's what it's called when you use a potato as the electrolyte for a battery.