4. Find out "fresh" battery has gone through so many cycles it only has half its capacity left and find yourself stranded just short of the next "filling" station.
Look, all of these technologies have issues... maybe those batteries made from carbon that supposedly don't loose their capacity will end up being practical in a large scale, that would be great, but also, maybe this design will turn out to be a huge boon for the hydrogen car industry, basically solving one of the biggest problem in hydrogen fuel cells.... how to store enough hydrogen safely to have a reasonable rage.
Now I would be curious how the energy density of Ammonia, converted using this process, compares to that of gasoline which is currently pretty much top of the heap for portable energy density. It would also be nice to know how it compares to the current generation of batteries.
Everyone has their own particular chosen winner/looser but that is stupid. Innovation could come from anywhere and right now we need all the irons in the fire that we can get. We can't afford to put all of our sustainability money behind one thing that may or may not turn out to be the best choice in the long run.