Mine had a replacement set in year 2 just before I bought the truck (brand new factory ones) I had to change them about 4 years ago. My truck had a bad fuel shutoff relay which caused the original owner lots of grief, lots of crank and no starts, and aparently by the damage and wear to the batt cables, lots of jump starts!

 

Originals here too. They're leaking acid now, but still turn over great.
"replace every 2 years." now that's funny right there.

 

I guess that my opening my big pie hole has caused me bad luck. On the tuesday after memorial day, my truck wouldn't start. You guessed it DEAD Batterys. I was on the road and needed to go to Wally world. 2 Maxx 27's at $68.98 a piece and no charge for the install. All in all 6 years 6 mo, is not bad for them original batterys.