If by “last 20x as long” they mean the storage capacity and not the useful lifetime of the battery then this is truly awesome!
It would make super long range battery powered drones possible and even small, electric engined general aviation aircraft a real possibility.
Lasts twenty times as long probably means that it will hold a charge twenty times longer while not being used.
Yes...it is interesting how that claim is only mentioned in the headline with no details in the article. Methinks the "20x" refers to the useful lifetime. Otherwise, they'd be trumpeting this as the main feature and charge time would be a close second but not as nearly as mind blowing.