After 54 months and 60,000 miles, no apparent issues with battery related problems.
$300 - 400 for new battery puts a damper on switching it out every 3 years for the heck of it. Many here say that it should last 6 -7 years. I'm going to replace mine at 6.
I see no reason to push it, just to see how long it lasts. No need to be stranded somewhere.