I have a 2006 530xit in need of a battery replacement. The original battery was replaced abt 40 months ago when I bought this CPO car from a midwest dealer. I wonder if a full replacement is covered under the CPO warranty (?). If prorated, I may be better off (less expensive) to buy a Sears Die Hard and just replace it myself. There seems to be some plastic trim pieces around the battery that I suspect must be removed (?). Does anyone have "diy" battery replacment instructions ? Your help will be appreciated.