2001 Mercedes CL-Class Owner's Manual - Page 353

The service life of the battery is dependent on its condition of charge. The battery should always be kept sufficiently charged, in order to last an optimum length of time. 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. The maintenance-free battery is located in the trunk under the right-hand wheel well cover panel. For battery removal or installation, or jump starting the vehicle, first lift the trunk floor, then turn lock (1) counterclockwise and remove cover. Important! Battery replacement information: 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. Battery Instruments and controls Operation Driving 347 Instrument cluster display Practical hints Car care Technical data Index