I would have to say it ultimately is a disengaging feel, so it would be a lurch forward as if you popped the car into neutral. It would make sense of the regenerative braking but in my mind I *KNOW* it's literally the transmission disengaging, because it's the same "jerk" when you take the foot off the brake and it clunks back in gear/engages. This is NOT present at all in the sports mode. It actually is not at all present in my wife's 2016 X1. The dead spot is a completely different issue that is also exaggerated by the transmission clunking back into gear AND the dead throttle input.
I would think that it does not matter if the battery is fully charged or not, because the regenerative braking is a function of braking to gain energy. Even if the car is fully charged and then started I would think the charging system will still act the same in that aspect.
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