Most of cell energy density comparison don't remove cell casings mass from comparison. This way pouch cells outperform hard cased ones so much on capacity, but

Most of cell energy density comparison don't remove cell casings mass from comparison. This way pouch cells outperform hard cased ones so much on capacity, but in reality it's a big delusion as you still have to put structure to hold cells in place — and you can't do it with flimsy, paper thin casings.