Lot's of variables go into how long an automotive battery can, or should, last. How old is your starter and how many amps does it draw and how long does it take to start the engine? How many times a day do you start the engine? How far do you drive between startups? How many power accessories are on the vehicle?
The factory battery on my 2005 Pontiac Vibe, a 4cyl with no power windows/doors/seats, etc, lasted about 8 years. That is the longest, by far, any auto battery has ever lasted me. At the 5 year mark, I started to get leery about it because I take it to some very remote places in Colorado, both mountains and Eastern plains.
Typically, 4-5 years, even less when I had diesel cars.
