Looking through the receipts of the previous owner and the Porsche dealer estimate back in 2010(March) of a new battery was $331. He went with a Canadian Tire battery installed in the Box for $133.33. Can. Tire is like your Target or Sears. I would
have done the same thing. This battery handles our Can. winters very well. Model was ELM-48-690. I have a 2001 Boxster base 2.7l.Keep looking
