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Dave is right, the best thing you can do for an automotive battery for it to last a long time is use it to start an engine everyday and charge it with an alternator. Three things kill batteries, shock, doing nothing, and being discharged.
Supposedly there are "northern" and "southern" batteries, or used to be. On account the high temperatures down south just kill batteries and they were constructed a bit differently to try and get them to last longer. Something to do with the isolaters and quantity of electrolyte.
One thing I don't get is how many people tend to be pretty fussy about some things (oil and filter, fluid changes, washing and waxing) though seem to take some kind of weird pleasure out of torturing the electrical system. Batteries should be charged periodically and tested, like anything else and it probably pays to replace them prior to outright failure.
If you go on Interstates website there is a picture for which battery line they recommend for what climate you're in.