my car is still under warranty
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2009 Mercedes-Benz C300 4MATIC Question: Can I get my battery replaced under the factory warranty?
Answer #1M & R Car Import Services (69 Answers) , Chicago, IL - (773) 840-8204M and R Car Import June 30, 2013, 08:08Technician
I doubt it because it seems like your battery might be 4+ yrs. Also batteries are maintenance item. I would say ask your regular independent Automotive Service Facility and have perform a battery/charging analysis to see what is cause of your vehicle malfunction. Best of wishes.