In the Las Vegas Heat, the life expectancy of a NEW battery is a little over 2 years!
I have lived here long enough to base a battery purchase on the warranty because I have found this to be true and without any warning or prior slow cranking issues.
The last few I bought at SAM'S had a 3 year FREE Replacement, I've never seen any Brand last 3 years in this heat. So I jumped on it, they say they are redesigned for Desert Heat, we'll seeeee! the last one's did tooooo......
So essentially you pay for 2 up front in this area. With a fleet of 3 cars it adds up.