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Have a friend of mine who has a 09' ram 1500 quad cab with the 5.7 V8. He has 80K on it and still has the original battery in it. He lives in PA so the truck sees all climates. That's got to be a record.
If I'm not mistaken, the factory spec for the battery is a 730 CCA H7 battery. If there is an extra 1.5" of length on the battery tray(height and width are the same), you can put in the Odyssey 49-950. That's about one of the highest rated H8 batteries you can get. I just put one in my EcoD, it's a 950 CCA AGM battery.I think the stock battery is basically borderline strong enough for cranking the hemi in very cold temps. I would look at a stronger aftermarket battery rather than a stock battery.