Mos def sounds like yer batt.
How cold, when you say cold, do you mean? Cold weather is worse on MOST average batteries. When you last turned it over, did you remember to turn everything off afterwards? Was your trunk lid ajar? A door maybe? An interior light stayed on? 2 weeks, in cold temps, with even a minor draw on the battery, is a great way to kill it.
2006 V6 - Black on black. Tints, Louvers, Shorty Antenna and BBK CAI. "We're just getting started folks!"