Oh and your lucky you live in warm climates you can use cheaper batteries. Unlike where I live. It is the cold that hurts them not the heat (within reason)
I know it's rather late but, actually that is not the case.
Heat is what destroys batteries, except faults aren't magnified until the car relies heavily on the battery (eg. cold weather). People generally blame a battery's lack of function on the cold, when it really isn't the case. Battery's of course rely on chemical reactions to produce electrons (eg. power), acid reaction to lead plates. When hot, this reaction is escalated, of course in effect causing the output of the battery to be higher. As it is hotter the plates corrode much quicker
, due to the chemical reaction occurring quicker when hot.
Then, when cold, the chemical reaction is slower, and you realize it then. As heat is introduced to the battery, the plates are more corroded, so when cold, the slowed reaction is further impaired by corroded plates.
I mean, logically as long as batteries don't freeze, and kept cooler, this preserves the battery.
I hate the whole cold weather crap, just a myth.
I hope I made sense, on web forums I rush.