A fuel cell is a battery. It has the same fundamental efficiency as any other battery. Of course, this is not how it works in the real world, but people who cit

A fuel cell is a battery. It has the same fundamental efficiency as any other battery. Of course, this is not how it works in the real world, but people who cite "efficiency" are usually greatly exaggerating how it works. Most batteries cannot reach 95% efficiency, especially if they need to store energy for long periods of time. Round trip efficiency of hydrogen will beat any ICE doing the same thing, and with heat recapture will basically match a li-ion battery. In situations where li-ion is poorly suited, such as cold weather or long-term storage, hydrogen will often be more efficient.