2008 Mercedes CL-Class Owner's Manual - Page 706

Practical hints Batteries Switching off vehicle's internal electrical functions Disconnecting starter battery Open the hood ( page 553). Use a 10-mm open-end wrench to disconnect the battery negative lead. Remove cover 2 ( page 704) from the positive terminal. Disconnect the battery positive lead. Removing starter battery Warning! Charging battery i Vehicles with KEYLESS-GO: remove the KEYLESS-GO button ( page 366) and use the SmartKey with KEYLESS-GO like a normal SmartKey. G Turn off all electrical consumers. Turn SmartKey in starter switch to position 0. Turn SmartKey in starter switch to position 1. Wait for 30 seconds. The vehicle's internal electrical functions are switched off. Turn SmartKey in starter switch to position 0. Never charge a battery while still installed in the vehicle unless the accessory battery charge unit approved by Mercedes-Benz is being used. Gases may escape during charging and cause explosions that may result in paint damage, corrosion or personal injury. An accessory battery charge unit specially adapted for Mercedes-Benz vehicles and tested and approved by Mercedes-Benz is available, permitting the charging of the battery in its installed position. Contact an authorized Mercedes-Benz Center for information and availability. Charge battery in accordance with the separate instructions for the accessory battery charger. i For your convenience, have the starter battery removed by a Mercedes-Benz Center. Pull out the battery ventilation hose from the battery (depending on battery arrangement in your vehicle model, the ventilation hose is located either on the left or right side of the battery). Fold bar on starter battery up. Take out the starter battery. ! Do not remove the SmartKey! i Have the batteries charged by a Mercedes-Benz Center. If you charge the batteries yourself, follow the operating instructions for your charging device. 705