Dave5

Ooooh this is seriously cool

The Helios Horizon’s previous lithium-ion pack delivered 260 Wh/kg (watt-hours per kilogram, a measure of how much energy a battery holds relative to its weight). The new solid-state cells hit 410 Wh/kg, a 60% jump. Chief test pilot and company founder Miguel Iturmendi expects that figure to grow another 40% within two years.

https://newatlas.com/aircraft/helios-horizon-first-crewed-solid-state-flight-aviation