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If a car were a mild hybrid it would simplify things to have a single 48v high capacity traction battery. Would there even be a need for contactors that disconnected a 48V traction pack when the car is "off"? It seems all cars should probably at least be mild hybrid so they can shut off when stopped while running accessories, start with the traction motor/batteries, and get a little boost of power so the engine could be undersized. Maybe a 1kWh battery pack?
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