Just make sure it fits your car’s battery compartment. Generally the companies selling these battery insulation kits will have a form on their website where you can put in your car model and year, and it will tell you if your battery will fit their kit – like here (top of page). These protective battery sleeves are usually made of plastic or an acid resistant, thermal resistant material. These car battery insulation kits will insulate your battery and protect it while still allowing proper ventilation. Tip 5: Fully charge your car battery at least once a week (use a car battery charger or interchange batteries if you have to) Your car battery drains even when the car is off. This happens because current is drawn from the battery by car accessories (radio, lights, etc.) or the car computers. But to prevent this, you can use either a car battery charger or a solar battery charger. Car battery chargers (regular or solar) will maintain the optimum charge level of your car battery when the car is not in use. View our Free Presentation to learn how to bring old batteries back to life again