2000 Mercedes S-Class Owner's Manual - Page 353

Instruments and controls Battery Operation Driving Instrument cluster display Practical hints Car care Technical data Index 350 Therefore, we strongly recommend that you have the battery charge checked frequently, and corrected if necessary, especially if you use the vehicle less than approximately 200 miles (300 km) per month, mostly for short distance trips, or if it is not used for long periods of time. Only charge a battery with a battery charger after the battery has been disconnected from the vehicle's electrical circuit. Always disconnect the battery negative lead first and connect last. When removing and connecting the battery, always make sure that all electrical consumers are off and the electronic key is in starter switch position 0. The battery, its filler caps, the vent tube and the opposite plug must always be securely installed when the vehicle is in operation. While the engine is running the battery terminal clamps must not be loosened or detached, otherwise the generator and other electronic components would be damaged. Note: After reconnecting the battery also set the clock (see COMAND operator's manual) resynchronize the front seat head restraints, the express feature of the power windows, the sliding/pop-up roof, and the electronic stability program (see head restraints on page 72, power windows on page 181, and electronic stability program on page 274). Battery recycling Batteries contain materials that can harm the environment with improper disposal. Large 12 Volt storage batteries contain lead. Recycling of batteries is the preferred method of disposal. Many states require sellers of batteries to accept old batteries for recycling.