Well I had mine since '06 and its went thru -10 and up to 108 degrees and with running all my fog lights, strobes, and stereo system, I think it did quite well

 

That's not so bad and the truck that I had at that time I don't know how old the batery was but the only thing that pissed me off was that we had to pull it home

 

The optima in my XJ is amazing and never given me a single issue. I can go through any lead acid battery (no matter what the warranty) in 3 years. Maybe one or two have lasted 4 years, but those tend to give me issues.

 

Optimas are tuff I'm planing on getting an optima when the batery in my truck is shot