2008 Mercedes SL-Class Owner's Manual - Page 430

Practical hints Batteries Disconnecting the batteries Open the trunk. Read and observe safety instructions and precautions ( page 290). Open the luggage cover in the trunk ( page 211). Remove the trunk floor. The battery for electrical consumers is located in the right hand area of the trunk ( page 400). Use the 10 mm open-end wrench from the vehicle tool kit to disconnect the negative lead from negative terminal 5 of the consumer battery ( page 427). Warning! With a disconnected battery G ! Always disconnect the batteries in the order described below, even if you only want to charge the starter battery, for example. Otherwise the vehicle's electronics can be damaged. you will no longer be able to turn the SmartKey in the starter switch and pressing the KEYLESS-GO* start/stop button on the gear selector lever will have no effect the gear selector lever will remain locked in position P Apply the parking brake ( page 63). Make sure the gear selector lever is set to position P ( page 172). Close the retractable hardtop ( page 204). Turn off all electrical consumers. Turn off the engine ( page 64). Remove the SmartKey from the starter switch. Vehicles with KEYLESS-GO*: Open the driver's door. 429