I just replaced my battery after it died last week. 4 1/2 years old is typical for a car that sits at the airport for weeks at a time in winter. However, it was the worst battery to remove I have ever dealt with. Changing a battery should be a 5 minute job. I had to wrestle this thing out of its nest. Terrible engineering. While I was in there I had a look at the air filter. Another engineering fail. The most convoluted airbox design possible, with the filter bottom as part of the airbox shell. The intake splits into two going into the airbox. Just silly nonsense.