Hydrogen vs. Battery Electric Cars

Everyone commit a huge error when they compare the efficiency of Hydrogen vs Battery.
That error is so big, that the real answer is that hydrogen is more energy efficient (even for cars) in most cases than batteries.
It all depend on dealing with the intermittency issue of clean sources like Solar and Wind including all the energy sectors that require one way or another hydrogen and the cost to transport energy by wires vs pipeline. 
If you need to store the energy of 2 days of strong wings, the only limitation factor by hydrogen is the size of your tank (which is just a negligible cost vs the electrolyzer 90% efficiency, that split water), this mean you lost around a 12 or 25% of the energy depending your transport and storage methods, plus the extra 40% lose in the fuel cell, so you lost around half of that (source to wheels). 
Now, using the same capital cost, you can only store 4 hours of those 48 hours of wing power output.  This mean you are losing  a 92% of the output + 12% of batteries + 12% of your car batteries +7% wire loses, so around 96% of the source power lost. 
If you want to double the capacity of your batteries, to 8 hours, your capital cost also doubles. 
Now some may say, but we can use the same car batteries to store that power, but the issue is the same, beyond 4 hours of storage, hydrogen becomes more cost effective, not only that, what happen when you need to store season disparaties?   Summer of solar vs winter. 
Then you have that hydrogen pipeline transport is 10 times more cost effective than electricity by wires.
For last.. we have that the 60% of all the energy consumed by the world needs to be on chemical state (hydrogen in this case), because airplanes, ships, no electrify trains, long range trucks, the natural gas network, all those energy sectors can not work on batteries. 
So if you want to clean all energy sectors, you need to generate clean energy with solar and wind and 60% of that needs to be one way or another chemical energy, this mean that you can not count the 40% energy lost from fuel cells, because you need that one way or another, this mean you balance the power grid just converting excess to hydrogen, as you need to produce a lot more for all the other sectors there are almost few cases that you would need to convert hydrogen to electricity again to feed the power grid.  
It is incredible that no youtuber understand these cases, and that is the reason why almost all countries had huge hydrogen roadmaps planned.