Took my annual trip to Austria for skiing last week. It's about 1000km away.
My car is not voltage capped (368 km at 100%) and has about 7-8% degradation after 160,000km. I charged to 100% before leaving and installed software 2020.4.1 a day before.
Usually I take 6 or 7 supercharger stops. Overall it took me about ~45 minutes longer overall charging than usual. Chargegate is definitely a thing. However, I did still see speeds of 120kW+ at low SoC (5-10%), up to about 20% it's still above 95 kW and then tapers off (50% SoC is about 60kW, 70% is about 35-40kW).
Arrived with about 20% remaining at my destination, charged it up with a 22kW AC to 90% and parked it (indoors) for the remainder of the week.
I rarely checked the SoC of the car as I just want it sleeping. However, after 7 days and packing the car the SoC was at 74% and a "maximum battery charge level reduced" error was on the screen.
Drove 150km to a Supercharger. Arrived with about 10%. It showed I used about ~35 kWh / 65%, or extrapolated a maximum capacity of ~54 kWh. The supercharger wouldn't allow it to charger further than 19% (and 15-19% took 20 minutes), as well as showing "charging completed".
I called roadside assistance and they saw a highly imbalance in the pack. They advised me not to supercharge further and try to make it to the service center in Munich. I used two destination chargers to get there. At that point it wouldn't even charge above 7% anymore.
Had to get a rental car (ICE) to get home, the fee will be reimbursed if it's a warranty problem (which it should be). They wouldn't give me a Tesla loaner, as they don't have European wide insurance, so I wouldn't be allowed to take a Tesla loaner outside Germany to the Netherlands
. Even more annoying is that I will have to drive 800km with the rental, then 800km back home to pick the car up.
My pack has part number: 1014114 - 00 - E.
Funny enough, the battery is at 0% now (24h later) and still parked where I left it (6%) after telling them specifically the drain is enormous. Their problem now...
So, even though everything seemed fine at first, the pack just gave up. Will keep you guys informed about any developments.
Edit: Couple minutes after typing this I received a call. New battery is ordered and hopefully it will arrive early next week. The car should be ready soon after then too. Everything (including the rental) covered under warranty.