For heavy-duty vehicles requiring significant range, why might a fuel cell system offer better overall energy density than a massive battery pack?

Answer

The fuel cell system carries the energy externally in a tank, reducing the weight penalty associated with internal chemical reactants.

For long missions, a battery pack must carry heavy chemical reactants internally. A fuel cell system only carries the fuel externally, leading to better overall energy density for that specific, long-range mission profile.

For heavy-duty vehicles requiring significant range, why might a fuel cell system offer better overall energy density than a massive battery pack?

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