Ah, simply have separable battery modules that you drop from the plane as their charge is depleted. Put pop-out wings on them and use gps guidence so that they

Ah, simply have separable battery modules that you drop from the plane as their charge is depleted. Put pop-out wings on them and use gps guidence so that they glide back to recovery centers on the ground, which you've had the foresight (and funding) to build in sufficient density along any likely route your plane might operate. Problem solved. I'm joking, mostly.