Lack of battery care and maintenance combined with cold weather has a way of bringing out the borderline batteries that were fine in the summer, but don't have the power for a cold weather start. And not just winter, battery care and maintenance is a year round requirement. You want to catch a bad battery before it lets you down, usually on one of the coldest days of the year.
Testing and maintaining a battery is fairly simple and only requires a few basic tools. If you only think about your battery once a year, fall would be a good time to go outside and spend some quality time with your battery.
IMPORTANT SAFETY NOTE: Before you do anything with a battery, you need to wear eye protection and keep any open flames away from the battery. This includes cigarettes and other smoking products. Batteries produce hydrogen gas that is extremely flammable. Batteries contain sulfuric acid so I would also recommend wearing latex gloves to keep battery acid from burning your hands.