Here are some other ways to prolong a car's battery, courtesy of CAA:
1. Check for corrosion. Corrosion can prevent a car from starting, and it's caused by a faulty connection between the battery case and post. It can be aggravated by loose battery terminals, cracks in the battery casing, debris, and extreme heat and cold, as well as over-charging. Regular battery inspection and cleaning can help prevent this.
2. Turn your accessories off before you turn off your car. Starting a car with the heater and radio set to full power can drastically reduce a battery's life.
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3. Disconnect your battery if you're parking your car for the winter. If you plan on keeping your car in the garage during the colder months, disconnect your battery. This will prevent erroneous drain.
4. Car accessories should be minimized all year round. Dead batteries don't just happen during the winter. In addition to the corrosion that can arise from extreme summer heat, air conditioners are a huge source of battery drain.
And remember - the better you take care of your car's battery, the longer it will last.
“I've seen car batteries last as long as seven years, with proper care,” Datzkiw says. “While this isn't typical, it's certainly possible.”