Ditto on Michael's comments.
I have an 6 mos old Optima in the BMW 325is, 12 mos old DieHard in the E320 Coupe, and Original '94 MB in the E500.
My experience is that high quality car batteries last a good 5+ years with no problems here in N.Cal. I've had Interstate's, Diehard's,Delco's, Original MBs/BMWs/Alfas etc. over the past 15 years.
I'm observing the "new tech" Optima's longevity for myself currently. Note that all my applications are/were stock cars, with no big stereos or heavy draw accessories.