I have my suspicions that these Ultrafire 18650 batteries may not, in fact, have had the full 3000 mAh capacity claimed on the wrapper.
And that they might ALSO not have had the protection circuit the wrapper claimed they did.
And that they might have actually held AAAA cells, though as I haven't ACTUALLY cut open those foil pouches to verify that, I might shouldn't draw any conclusions from the outline of the object vacuum-sealed in there.
Not pictured: about a metric butt-ton of clay packed around the inner cells.
Ah well, at least they were free. And, you know, didn't blow up in my hand. That's always good too.