Ensure the vehicle is turned off and parked in a safe location.
Open the hood of your vehicle. You may need to release the hood latch from inside your car or use a key or remote to release the hood.
Locate the battery. In the CLK 320, it is typically situated on the passenger side of the engine compartment.
Identify the positive and negative terminals on the battery. The positive terminal is usually marked with a "+" symbol and the negative terminal is marked with a "-" symbol.
Disconnect the negative terminal first, using a wrench or socket. Be cautious not to touch the positive terminal while you're unhooking the negative one, as this can cause a spark.
Disconnect the positive terminal.
Remove the old battery from its compartment. Be sure to lift it straight up, as it is usually secured by a clamp.
Place the new battery into the battery compartment. Make sure the positive and negative symbols on the battery match the corresponding terminals in the compartment.
Reconnect the positive terminal first, followed by the negative terminal.
Secure the battery with the battery clamp.
Close the hood of the vehicle.
Turn on the vehicle and check that all electrical components are functioning correctly.
If you're dealing with a Mercedes CLK 320 older than 2006, the process may be slightly different, so it's advisable to consult your owner's manual or seek assistance from a professional.
