Elektronische Komponenten für Rennräder

Yes! Modern electronic components are reliable and weatherproof. Manufacturers recommend avoiding powerwashing and fully submerging your electronic groupset fitted bike - However, most people avoid doing this with a regular cable-shift / mechanical bike anyway.

Yes, there are warning lights on the junction box of Shimano Di2. In the event of the battery fully running down, the front derailleur stops first, at that point there's still usually around 100 shifts of battery power for the rear derailleur. Modern batteries last so long, they can be taken for granted and not checked regularly - it's a good idea to check the battery life indicator every few rides.

Solid Green light - 75 - 100%

Flashing Green light 50 - 75%

Flashing Red light 25 - 50%

Solid Red light 0 - 25%