This goes back to the old Roadster days. If you were "bricked" you were beyond the point of bringing it back with a jump or charge. The so-called "anti brick" reserve is meant to keep our cars from getting to that point. None of this, including how much or if it's included in the advertised kW capacity, is documented anywhere that I'm aware of.
Yeah, there is a reserve they don't let you dip into; that's when they ultimately shut you down, but you can drive for miles past zero before that happens, usually. The car goes into super sleep mode when you get near the point of no return for the pack. If the car sits in your garage unplugged for a long time, then you probably can't just jump the 12 volt system.
It varies with temperature, but my pack holds back about 5 or 6 kwh in reserve.
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