I had my 2007 3.0i roadster in for a checkup, and the local dealer checked the battery, and told me it failed a load test. His recommendation was a new battery, with a price in excess of $300. This is the 6th winter on the original battery, so the diagnosis sounds reasonable. The price seems high to me, and since there are two imported car shops in my town, including one that seems to like German (MB and BMW) I want to check them out. I also have a good guy who specializes in restoration work, primarily corvette, but seems to be up on most things. My question is what is involved in installing a new battery? I have seen talk about registering the new battery on some models, but have no idea what that entails. What should I be looking for, and what is a reasonable cost? I live in Connecticut, which will probably have some effect on the $$$$. Thanks in advance.