[fvjwiur]

what part of lithium-ion batteries is heavy ? Lithium is light

[ozzy6009]

The rest of them. Lithium is only the electrolyte. They also need cathode and anode materials.

Specific energy of gasoline: 46.4 MJ/kg

Specific energy of high end Li-ion batteries: 1.3 MJ/kg

[fvjwiur]

it amazes me that we've achieved so many hard things (going to the moon, to Mars, to Saturn, making computers) and yet batteries are so primitive that we can't even beat gasoline