I will be charging mine Sunday (after running in hybrid) and will do so three times as daughter is back in school, so will monitor my battery % when no electric range left, ready for when you return of holiday. However I have seen both 15 and 20%.
I find it holds gears especially in the lower half of the box. My cure is to drop of throttle a little untill it changes up a gear, without any major impact on speed travelling or quickly blip the throttle. I find your in that middle spot where the car isn’t sure, wether to change up or not. That said, I still prefer it to a DCT box but, was hoping it would have come with the newer 8 speed wet clutch. Guess that will be on the next facelift!