All Subaru vehicles are equipped with maintenance-free batteries. The term “maintenance-free” can be misleading – as these batteries do require some attention to maintain their cleanliness and efficiency.
It is extremely important to have your car’s battery checked by a Subaru-trained technician regularly. A battery check will include an examination of cable connections for cleanliness and tightness. Loose or corroded connections can dramatically diminish your car’s starting power; and if the connections grow loose or crusty enough, they can shut off your car’s electrical flow entirely and leave you thinking you have a dead battery.
High temperatures also reduce the efficiency at which a battery is recharged.
Fall/Winter driving conditions frequently require the use of A/C for extended periods while driving at slow speeds. This additional load requires the charging system to work properly so that it sufficiently charges the battery the next time you start your car’s engine. For this reason, your service technician should also check your battery’s charging system and voltage regulator, and inspect your vehicle’s alternator to ensure that all components are operating properly.