Get real. If those scumbags make a battery with air inside they should have made it smaller.
Wouldn't really fit as a replacement for a D-cell then would it?
noun: irony
the expression of one's meaning by using language that normally signifies the opposite, typically for humorous or emphatic effect.
Dave was have a bit of fun winding up mock outrage. You can tell from the first few minutes. I'll quote him.
"In addition to having them clearly marked on the batteries themselves, in the datasheet, everything's legitimate. It is marked on the packaging, there it is, 2500mAh..."
"These are legitimately less capacity"
and he proceeds to bounce them in a manner akin to his video on alkaline cells as a
capacity test.
It wouldn't surprise me if he was flirting with this idea as some form of April fool prank but he couldn't quite figure out how to make it work to his satisfaction.
Of course I could be quite wrong.