2003 Mercedes C-Class Owner's Manual - Page 306

Practical hints Jump starting Jump starting Warning! If the battery is discharged, the engine can be started with jumper cables and the battery of another vehicle. Observe the following: Jump starting should only be performed when the engine and catalytic converter are cold. Do not start the engine if the battery is frozen. Let the battery thaw out first. Only jump start from batteries with the same voltage rating (12 V). Jump starting with a more powerful battery could damage the vehicle's electrical system, which will not be covered by the Mercedes-Benz Limited Warranty. Only use jumper cables with sufficient cross-section and insulated terminal clamps. Always make sure that the jumper cables are not on or near pulleys, fans, or other parts that move when an engine is started or running. G ! Jump starting may only be performed on the battery installed in the engine compartment. Avoid repeated and lengthy starting attempts. Do not attempt to start the engine using a battery quick charge unit. If engine does not run after several unsuccessful starting attempts, have it checked at the nearest authorized Mercedes-Benz Center. Excessive unburned fuel generated by repeated failed starting attempts may damage the catalytic converter and may present a fire risk. Make sure the jumper cables do not have loose or missing insulation. Make sure the cable clamps do not touch any other metal part while the other end is still attached to a battery. 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 very explosive. Keep flames or sparks away from battery, avoid improper connection of jumper cables, smoking etc. Read all instructions before proceeding. 306