If it is near your home, you can run a mechanics light from your house or garage and hang it in the engine compartment near the battery. Rest the hood closed, don't slam it. The heat from the bulb will help your battery resist the cold. === === Also, a fully charged battery better resists the effects of cold temperatures.
Saturns don't like the cold. Keep your battery in good condition and try to garage it.
Keep the battery charged and run it once a month for at least 30 minutes.
Keep the car light on
I don't really know about cars but usually it's not the battery it's the car.
Get a battery with the most CCAs that will fit your vehicle.
Yes, that is how you know that the battery is "strong" enough to start your car in cold weather. A battery in warm weather may have enough amps to start the car fine, but in cold weather, it wouldn't be able to crank it fast enough. A car battery efficiency drops off the colder it gets.
Cranking the car or starting the car in cold weather can wear out a car battery. You can also wear out the battery by turning the starter over without fuel in the tank.
The cold weather slows down the chemical reaction that goes on inside the battery.
Purchase a trickle charger and keep it connected to the battery.
No fuel?
Yes, there is really no van battery or car battery. There is just an automotive battery. Installing a battery with more Cold Cranking Amps (CCA) is fine and will just provide more power in cold temperatures.
The problem is probably the alternator. If the alternator fails to keep the battery charged the battery will keep the car running until it can no longer supply voltage to essential systems and the car will stall.