I live in Spain, I have bought lot of stuff online in german webs. Once I have some issue and I applied the warranty without no problem and at zero cost.
The bike seller installed SUPERNOVA-E-Bike-Front-Light-M99-Mini-PRO-MonkeyLink by using the Monkey-Link connector connected to the Bosch battery. I use it every day/night to go to work and I did not notice higher consumption of battery.