That applies if you’re looking at density per weight - but for most stuff driving around the interesting metric is density per volume, and hydrogen sucks there, even if we’re looking at liquid nitrogen, which is completely impractical for storage here.
To make matters worse, you’re limited to specific shapes for your pressurized tank if you want to optimize pressure it can take (and with that storage volume), while batteries you can stick in individual chunks pretty much wherever you find a bit of space.
While LH2 is about 1/3 the density of gasoline as heat energy, and 3/4 the density for electric energy, it is about 2kwh-electric per liter. Lithium batteries are under 1/4 of that.
That applies if you’re looking at density per weight - but for most stuff driving around the interesting metric is density per volume, and hydrogen sucks there, even if we’re looking at liquid nitrogen, which is completely impractical for storage here.
To make matters worse, you’re limited to specific shapes for your pressurized tank if you want to optimize pressure it can take (and with that storage volume), while batteries you can stick in individual chunks pretty much wherever you find a bit of space.
While LH2 is about 1/3 the density of gasoline as heat energy, and 3/4 the density for electric energy, it is about 2kwh-electric per liter. Lithium batteries are under 1/4 of that.