3 Ways to Increase Car Battery Life

Car batteries should be able to last about six years in most modern models. However, this is only provided you do everything right. The most significant drain on car batteries over time is often due to lack of maintenance and negligence at the hands of the owner. With the problematic factors taken into account, a more likely estimate for your car batteries are between two to four years.

Limit the use of electronics while your engine is idling

The most common way for a battery to be sapped is by leaving electronics (such as the headlights and stereo) on without having the engine on. While an active engine will take power via fuel consumption, active electronics with the engine off will stem directly from the car battery.

Give the battery regular attention and maintenance

Keeping a battery clean is important regardless of how much you use the vehicle; if you're not driving the car or storing it for the season, the engine should still be started up regularly. Turning on the engine and letting it run for a couple of minutes every week or so will ensure that the battery is kept active enough to endure. Disconnect the battery completely if you'll be away from it for long enough, and consider storing a manual charger in the car with you if you think it may be an issue.

Take temperature and climate into account
Both extremes of temperature tend to sap life from batteries. A car in extremely cold temperatures can be drained completely overnight if proper precautions aren't taken. Purchasing a specialized insulation blanket to wrap around your car battery will help lessen the impact of the climate. If you have a garage available, you should make use of it during colder months.

Source (YourMechanic)