And once inside the car, it makes almost no difference if the battery is arranged as 400 volts or 800 volts. The battery is made up of many cells. Let's arbitrarily say 200.
Each cell is ~4 volts. A 400 volt pack would have 100 instances of 2 parallel cells, put in serie to make 400 volts.
Each cell is ~4 volts. A 400 volt pack would have 100 instances of 2 parallel cells, put in serie to make 400 volts.
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During charging, all the current in the 800V arrangement would go through every cell. In the 400 volt arrangement half the current goes through each cell. The 800V pack only needs half the current for a given power, but the although the
BTW, the number of cells may be much greater than 200, but the same logic applies.
Given that current at 800V are half as much, this is mostly a wash for the two possible choices.