Your battery should have a date code sticker on the side. If the last digits are "02" or earlier, do yourself a favor and replace the battery before the cold weather sets in. Regardless of the length of warranty offered on a battery, 4 years is as far as you should trust, especially since you don't know the history.
Part of your winter prep should include a check of the entire charging system. Lots of parts stores offer the service for free. Some will even give you an honest appraisal, and not just try to sell you some parts.
Hope you got a good deal on the car. Enjoy!
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