What preventive maintenance can you carry out on the battery?

Your answer is correct. According to German traffic rules, preventive maintenance on a vehicle battery includes checking that the cable connections and battery support are firmly in place to ensure reliable electrical contact and prevent damage from vibrations. Additionally, cleaning and greasing the battery poles helps prevent corrosion, which can impair the battery's function. However, exchanging battery acid is not considered preventive maintenance for drivers and should be handled by professionals due to safety risks. Regularly performing these checks helps maintain battery performance and longevity.