Where are the 2 batteries located on a 1998 CLK320?

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I parked the vehicle for 2 wks and now the key won't turn in the ignition. None of the lights will come on and the doors will not unlock with the key fob. I just bought the car and it has 38,000 miles on it but needs some work done. If there are 2 batteries, what is the procedure for recharging them?