The **battery** of a vehicle is essential for starting the engine and supplying power to other vehicle systems when necessary. It is important to keep the **battery terminals clean** in all types of batteries, as this ensures good electrical contact and prevents operational issues.

- **Cleaning and maintenance:** Keeping the battery clean and dry is crucial for its proper functioning. Dirt or corrosion on the terminals can prevent the battery from working adequately, affecting the engine start and the power supply to other vehicle systems.

- **Universal importance:** It does not matter if the battery is maintenance-free or requires maintenance; in both cases, the terminals must be clean to ensure that energy flows correctly and the vehicle operates efficiently.

Therefore, it is essential to keep the battery terminals clean in **all batteries** to ensure their proper functioning and prolong their lifespan.