[_hypx]

It's bizarre how people refuse to accept that hydrogen fuel cells are technically batteries and have absurdly high energy densities. And if pressed, you usually hear some excuse like poor efficiencies, as if that isn't a powerful justification for pouring billions of dollars into the problem.

[Tagbert]

The problem is that “charging” that hydrogen battery uses enormous amounts of energy and produces large amounts of CO2. Until you can find a way to get hydrogen that does not produce CO2 and does not require much more energy than the electricity that goes into a li-ion battery, hydrogen is a non-started.

[_hypx]

As electrolysis is also an electrochemical process, it is identical in basic nature as charging a battery. These are statements revealing the writer's ignorance of the basic facts, proving the point that people are refusing to explore the existence of superior battery technology.

[Tagbert]

Yes, I do understand the electrolysis process. I also understand that it is a very inefficient process that takes significantly more energy as input than is produced in the hydrogen output. That is also something that must not be ignored.

[_hypx]

I don't think you do. The theoretical efficiency limit is 100% efficiency, same as charging a lithium ion battery. Reality is closer to this than what is in your head I suspect.