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That's mostly correct, but keep in mind that it's not exactly that the battery can't accept any more regen.


The battery is 360V nominal and would have a upper recharge limit of 403.2V, if not for the car's systems having an upper limit of 400V.


You recharge a battery by applying a voltage higher than its open circuit voltage. The higher the voltage difference, the more current the battery will draw.


But if the battery is near full (let's say 395V), the car will only go up to 400V - which is about 25kW of power drawn by the battery.


So although the car does know when the battery is full, it's not limited by that as much as it is limited by its own upper voltage limit.


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