Well the car has done 50,000km before I bought it and tbh in the winter it lost quite a bit of range (I've had a different EV previously and its range didn't decrease as much during the winter).
The car has a warranty on the battery valid for 8 years or 160,000km (whatever occurs first), the manufacturer promises it will have 70% or more capacity at that point.
ADAC did a test with a vehicle that reached 160,000km and its battery was at 91%.
I roll my eyes at this question because it's often framed as good faith curiosity, but it's often asked in bad faith by people that think it's a "gotcha" question, because they have this incorrect notion that EV batteries need to be replaced frequently. They see the warranty is 100K miles/8 years or whatever and think that means they have to replace the battery after 100K miles/8 years, yet fail to recognize that they don't apply that same logic to combustion engines with 30K mile/3 year warranties.
In my country it is 8y/160k km for batteries and 5-10y/150-200k km for ICE cars.
That being said, when a battery fails, it’s a €20,000+ whole unit replacement (e.g. for Audi e-tron 55 it is €26,500 in my country), while ICE failures very rarely need a whole unit replacement, usually it’s a €1700 turbocharger or a €400 injector or something of that caliber. Personal anecdote: my 12 year old 262k km BMW did not need any engine repairs until now, except for free manufacturer recall on the EGR cooling system. And it still has 1000 km highway range in the winter.
ADAC did a test with a vehicle that reached 160,000km and its battery was at 91%.