edit I am an idiot, who uploaded the image link as the URL. The original source should now be accessible
RMIT engineers say they’ve tripled the energy density of cheap, rechargeable, recyclable proton flow batteries, which can now challenge commercially available lithium-ion batteries for capacity with a specific energy density of 245 Wh/kg.
I’m going to let you in on a little secret.
They don’t disappear because of some conspiracy.
They disappear because they don’t do what they claim to. Or they only perform that way in a small scale on a lab bench. Or they are too expensive. Or vastly many other reasons.
I think this xkcd statement is equivalent enough: when someone says that they cured cancer in a petri dish, keep in mind that so does a hand gun.