And even voltage is just a rough proxy for the actual state of ions in the anode-cathode dance. When voltage goes down with temperature, the charge state does

And even voltage is just a rough proxy for the actual state of ions in the anode-cathode dance. When voltage goes down with temperature, the charge state does not change. But drawing a certain amount of joules will be very different because at lower temperature you'll need more coulombs for the same amount of joules, aka VAh. And at nontrivial discharge throughput, observed voltage will drop to much lower values than what a snapshot of the current ion-dance state would look like at steady state. This is the "smartphone SoC must not try performance bursts as it used to" scenario.