Mercedes-Benz CLK-Class Owner's Manual page 343

Practical advice
Troubleshooting
Leaving the vehicle parked up
Problem
You wish to leave the vehicle parked up
for a long period of time (longer than
six weeks).
340
Possible cause/consequence Suggested solutions
Consult a qualified specialist workshop,
e.g. a Mercedes-Benz Service Centre.
Disconnect the battery ( page 377).