2010 Mercedes S-Class Owner's Manual - Page 516

514 Jump starting The factory-equipped battery may only be replaced with a battery that Rhas Ris Ris Ris the same security features of identical size of identical voltage of identical capacity ! As any other battery, the battery may discharge if you do not operate the vehicle for an extended period of time. Have the battery disconnected at a qualified workshop or an authorized Mercedes-Benz Center in such a case. 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 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. Charging the battery G Warning! Never charge a battery while still installed in the vehicle unless the accessory battery Practical hints charge unit approved by Mercedes-Benz is being used. Gases may escape during charging and could cause an explosion that may result in personal injury, paint damage or corrosion. An accessory battery charge unit specially adapted for Mercedes-Benz vehicles and tested and approved by Mercedes-Benz is available. It permits 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 the battery charged at an authorized Mercedes-Benz Center. If you charge the battery 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. Jump starting G Warning! Failure to follow these directions will cause damage to the electronic components, and can lead to a battery explosion and severe injury or death. Never lean over batteries while connecting or jump starting. You might get injured. Battery fluid contains sulfuric acid. Do not allow this fluid to come in contact with eyes, skin or clothing. In case it does, immediately flush affected area with water, and seek medical help if necessary. A battery will also produce hydrogen gas, which is flammable and explosive. Keep flames or sparks away from battery, avoid