Re: Reality check time? - batteries don't lose weight
No, but you could lose the batteries. Just have some sort of power-transferring system drain batteries in a proper order (assuming you don't need the whole pack for voltage/current reasons) and then just eject them from the aircraft.
Then, you could have a fleet of these super-efficient Australian solar-powered cars I'm hearing about drive around reclaiming the dropped batteries and driving them to the nearest airport. Or even better, leave enough charge in the battery to power the car, just in case it's cloudy.