I think you raise a valid point, which is that thermal exchange management is a significant issue for fast charging batteries, regardless of capacity. However,

I think you raise a valid point, which is that thermal exchange management is a significant issue for fast charging batteries, regardless of capacity. However, Tesla already has deployed 250,000 watt chargers in real world use, so a jump to the 450,000 watt range is within an order of magnitude, and so wouldn't be inconceivable.