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well the battery could be bad. see being in winter is the worst time of the year for batteries. but because of that too it could make you believe that thats the problem. like peppermrj suggested have the system tested. at autozone they sometimes cant catch a bad battery or alternator. i know the battery in my moms car is bad yet she had it tested at autozone and it said it was fine. i know the battery is bad still.
as of your battery its is powerful enough. now you can get a digital multimeter and check for how much voltage is getting to the battery while running. it should range from 12.9-14.5 volts. normally it stays closer to 14.5 volts. when the car is off, the battery should have around 12.5 volts. this could be an easy check for you. check your battery on a cold day when its been sitting for a long time and see how many volts it has. if it is below 12 volts its bad. once a battery starts going below 12 volts it can get to the point that it wont start at all.
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