For a battery service a trained professional mechanic will remove the battery terminals and clean off the corrosion buildup. Once all the corrosion is removed, the battery will then be treated with some dielectric grease to prevent the return of corrosion. Battery terminal protectors will be placed over the battery post for added corrosion resistance. The battery terminals will then be connected back onto the battery and tightened to spec. The battery will be checked for proper operation to complete the service.