The document lists signs that indicate the battery in a Mercedes-Benz is nearing the end of its life. These signs include smelling rotten eggs when opening the hood, which could indicate a leaking battery. White corrosion on battery terminals or components is another sign it needs replacing. The battery may also take longer to charge and have trouble starting the car or powering electrical components when its charge is running low. An activated check engine light could also mean the battery is struggling to power vehicle systems.