Paxilpapa
Serenity, through modern chemistry
I can see where it can't be done for cars, but the planes could have battery packs plucked out like a cargo pod and replaced with a modified telahandler faster than a plane could be refueled,,, just have to make sure they don't fall out mid flight!!That's what I thought they would do, then a driver could quickly "re-fuel" by sliding in a fresh pack.
But, they are using many different sizes of batteries and building the vehicles in a "skateboard" design so the batteries are very low in the vehicle. I get one reason why, a low center of gravity, but you have to pull the body off some of these to replace the batteries when the time comes.