The battery in my 300CE is toast and no longer holds a charge. The battery that is currently in the car is branded as a Mercedes Benz and based on an old receipt it appears to be nearly 9 years old. I can get a AC Delco replacement from the local auto parts retailer for around $130. The dealer wants another $100 for a OEM one. Is it worth the exta $100 for the Mercedes battery or is there a good aftermarket alternative that will work equally as well?

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1989 300CE