How to Replace the Battery in a Mercedes C240


1. Turn off the ignition and any accessories inside the car. Remove the key to avoid accidental starting. Open the hood.
2. Lift the three clamps on the back of the battery filter box on the passenger side of the engine compartment. Remove the filter box cover to expose the battery.
3. Disconnect the negative cable with a wrench. Repeat the process for the positive cable. Remove the retaining nuts on the battery with a wrench. Lift the battery out of the battery tray.
4. Insert the new battery into the tray in the same alignment as the one you removed. Secure the battery with the retaining nuts, tightening them with a wrench.
5. Reconnect the positive cable and tighten it using the wrench. Repeat the process for the negative cable. Replace the filter cover and press the clamps down to lock it in place. Close the hood and start the engine to test the new battery.