All true... but have they ever made an unequivocal statement...

All true... but have they ever made an unequivocal statement that an energy ink skin patch WILL last (significantly) longer than 14 days?
If it has long-term durability, why was the power density test of only 3 hours' duration?

The ambition to charge an EV sufficiently to drive it away from the charging point is an interesting one indeed. Presumably, if they do succeed, then a cell of twice the size might enable them to drive twice as far? (however far that might be!)

Multi-layered cells => multiple times the distance?

P.