I've found another vape shop advertising those [0]. I would have expected consumer protection to crack down on them for false advertising, since this is in France and these shops have been operating for at least two years. They also have physical locations, so it's not like they're some kind of "dark store" that moves every week...

[0] https://www.lepetitfumeur.fr/accessoires-cigarette-electroni...

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edit: Even Conrad, supposedly an old store, is selling these things. They're advertised as batteries for "industrial solutions".

https://www.conrad.com/p/samsung-icr18650-26-non-standard-ba...