Can a car battery with no power at all still be used?

[StGabriela]

Whether a car battery with no power can still be used depends on the specific situation: if the battery only occasionally loses power once or twice, it can continue to be used; if the battery frequently loses power, it should not be used further and needs to be replaced promptly. The functions of the battery are: 1. Providing a strong starting current to the starter when starting the engine; 2. Assisting the generator in supplying power to electrical equipment when the generator is overloaded; 3. Supplying power to electrical equipment when the engine is idling; 4. Protecting the car's electrical appliances. The maintenance methods for the battery are: 1. Starting the car regularly to charge the battery; 2. Adding distilled water or a special replenishing fluid when the electrolyte is low; 3. Frequently checking whether the small holes on the battery cover are ventilated during daily driving; 4. Checking for signs of oxidation on the positive and negative terminals of the battery; 5. Inspecting all parts of the circuit for signs of aging or short circuits; 6. Turning off electrical equipment when leaving the car.