2009 Mercedes CL-Class Owner's Manual - Page 555

Practical hints Battery of identical size, voltage, and capacity as the factory-equipped battery. then uses very little power and the battery is spared. If the battery is discharged, you must use the mechanical key to unlock the vehicle. batteries yourself, follow the operating instructions for your charging device. Only use a battery charge unit with a maximum charging voltage of 14.8 V. X Charge battery in accordance with the instructions of the battery charger manufacturer. ! As with any other battery, have the battery disconnect at a qualified workshop or an authorized Mercedes-Benz Center if you do not intend to operate your vehicle for an extended period of time to prevent battery discharge. You may also connect an accessory battery charge unit expressly approved by Mercedes-Benz for your vehicle model to maintain the battery charge. Contact an authorized MercedesBenz Center for further information. The battery, the battery ventilation hose and the lateral plug must always be securely installed when the vehicle is in operation. ! Switch off the engine and switch off the vehicle's internal electrical functions before you disconnect or remove the battery's terminal clamps. You could otherwise destroy electronic assemblies such as the generator. Remove SmartKey from starter switch (vehicles with KEYLESS-GO: Make sure the vehicle's on-board electronics have status 0) when you turn off the engine and no longer require any electrical consumers. The vehicle Charging the battery G Warning! 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. Have batteries charged at an authorized Mercedes-Benz Center. If you charge the Z 553