2003 Mercedes CL-Class Owner's Manual - Page 313

Practical hints Battery Battery Warning! G ! Never loosen or detach battery terminal clamps while the engine is running or the key is in the starter switch. Otherwise the alternator and other electronic components could be severely damaged. Have the battery checked regularly by an authorized Mercedes-Benz Center. Refer to Service Booklet for maintenance intervals or contact your authorized Mercedes-Benz Center for further information. Warning! With a disconnected battery G Failure to follow these instructions can result in severe injury or death. Never lean over batteries while connecting, 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 improper connection of jumper cables, smoking etc. you will no longer be able to turn the key in the starter switch and pressing the KEYLESS-GO* start/stop button on the selector lever will have no effect the selector lever will remain locked in position P Warning! G Do not place metal objects on the battery as this could result in a short circuit. Use leak-proof battery only to avoid the risk of acid burns in the event of an accident. 313