I am using Mecedez E220 I perchaed an used car 2 years
I am using Mecedez E220. I perchaed an used car 2 years ago. The car is very good I am satiesfied with its performance . But now a days its battery is getting discharged after every 20/30 days. The battery is new. My mechanic is saying that we have to change its ulternater. Is that correct?