Gravimetric energy density of the best demonstrated cell (watt-hours per kilogram) — the frontier number for the whole field, because it sets range and weight. Conventional Li-ion cells top out near 250–300 Wh/kg; solid-state and lithium-metal designs target 400–500. Watch the fine print: lab/sample cells beat production cells, so each figure is labelled by stage.
The best demonstrated cell reaches 410 Wh/kg against 250 for conventional Li-ion — but conventional packs cost $115/kWh, and solid-state has to ride that curve down. No solid-state cell is in a series-production vehicle yet.
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