This is correct. It's like saying do "in the future we'll have gasoline that contains 2, 3, or 4 times as much energy." Sure, different gasoline chemistries hav

This is correct. It's like saying do "in the future we'll have gasoline that contains 2, 3, or 4 times as much energy." Sure, different gasoline chemistries have different energy densities. But there's thermodynamic limits to it, unless you're switching to an entirely different chemistry. IIRC, we're already at ~40% the thermodynamic limits of lithium, so tripling or quadrupling are out of the question.