I’d love gel and lithium-ion batteries in an ebike or a velomobile. It would result in a 40% increase in range with no extra weight, making them more of a viable alternative for somewhat longer commutes (think 10-15 miles). Sure we should be serving those by high speed public transit, but this would be a faster stopgap/alternative.

Oh and it would be useful for electric trucks too, even short-range ones could be made lighter with less batteries.