What Commercial Aircraft Will Look Like In 2050 | IFLScience
"Tesla CEO Elon Musk has said that once batteries are capable of producing 400 Watt-hours per kilogram...
....Given that practical lithium-ion batteries were capable of achieving energy-densities of 113Wh/kg in 1994, 202Wh/kg in 2004, and are now capable of approximately 300Wh/kg, it’s reasonable to assume that they will hit 400Wh/kg in the coming decade."
But don't charge your cellphone in flight, if you know what's good for you.