Hi Duncan, I would advise against disconnecting the battery as it may give a problem with the key coding. Use jumper cables to another vehicle. Once connected start the other vehicle and then switch on the lights of both vehicles together with the rear screen defrost, (this will stop any surge when disconnecting, and alleviate problems which may occur to the electronic managements systems.) Start the Benz and then disconnect the jumper cables from both batteries being extra careful to keep the crock clips apart. Take the vehicle to a battery shop and have the battery checked. Regards Johngee10
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