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Everything points to solid-state batteries being quite expensive and prioritized in higher end cars, think iX3/GLB/GLC/EX60, where people want more range and care less about weight (these cars get 100+ kWh batteries today). It will take time for these batteries to trickle down to lower range cars, I think.

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Initially yes. Longer term light vehicles will enable light vehicles which means low cost.

And if you can charge faster, you can use an even smaller battery.

If we could automatically plugin every time we parked, our battery could be sized down to just large enough for the distance of the max trip times margin.

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