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Most hybrids have a regular 12v lead acid battery that's going to discharge also, as it maintains all the 12 volt equipment.
On my C MAX hybrid, the 12 volt battery would discharge fairly quickly, as it ran the cellphone radio that allowed the user to remotly find the car, unlock it, etc
I doubt the traction battery would completly discharge, but if it did you would be unable to start the car and I don't think you would want to try jump starting a 400 volt battery.
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