I thought the same as you when my '09' failed to start last Oct. After hearing about all the early failures, I went to Walmart for a new one. Lucky for me they were out of our size battery. Went home, and on a whim, I cleaned up the terminals and she fired right up. They didn't look too bad either. Now, almost a year later, the original is still doing fine.Perfectly timed posts. Had to jump my truck of to leave work today. The truck has a build date of Aug 2010 so the battery should be a few months older then that. Yes it is the original battery. We had to jump it about 2 months ago when the grand-daughter was playing in the truck and left the lights on.
It's funny I changed oil during lunch, started the truck at about 1pm to check for leaks. Went to leave work at 5 and click, click, click.
So at 5 plus years old I'm not even going to test the battery. Will get the new one tomorrow.
Will have to decide, before the cold weather gets here, if I want to chance another winter with the original. I do carry a booster all the time. This Oct, I'll have my RL 6 years. Don't know when the battery was built.
I wonder how many batteries have been changed out just due to dirty terminals?