A Dutch startup says everyone's hugely underestimating the potential of battery-electric aircraft – that it's possible to build large battery-electric airliners covering distances most assume we'll need hydrogen for. Elysian plans to prove it. The company doesn't believe it'll need some giant leap in batteries to do it, either; it says it can take 90 passengers some 800 km (497 miles) using a pack with 360 Wh/kg. Amprius, meanwhile, was shipping 450-Wh/kg cells back in 2022, and Chinese giant CA...