After 9 years the OEM battery in my 03 Cobra finally died.
When it did it was right after the Woodward Dream cruise.
I dropped my buddy off at his shop where he works to get his car and that was it.
I shut my car off to go in and use the restroom and when I came out nothing, it was totally dead not even a jump would help.
I did drive the car the 50 miles home (with the dead battery in it) that night but it took some work to do it.
I guess I can't complain about getting 9 years out of it.