Wow, just put a lease on 2019 egolf. Did visit a dealer for car and battery state. Can confirm that my dealer can't check battery's health as well. Basically what they said is that "you could, by charge-recharge and driving those km". But when I asked what is the battery warranty for and when it is considered replaceable, they just waved their shoulders. Turn's out it's the same all over. It's so sad, cause Zoe / Leaf have some great tools for that..
I'm from Vilnius, Lithuania.