What are the differences between 4S store batteries and external ones?

[SanMiguel]

There is no difference between 4S store batteries and external ones. The functions of the battery are: 1. When starting the engine, the battery supplies power to the starting system, ignition system, and electronic fuel injection system; 2. When the engine is stopped or idling at low speed, it supplies power to the vehicle's electrical equipment; 3. When the generator's output is insufficient, it can assist in supplying power to the electrical equipment; 4. It mitigates voltage surges in the electrical system and protects the vehicle's electronic devices; 5. It can store excess electricity generated by the alternator. The maintenance methods for the battery are: 1. Start the car regularly to charge the battery; 2. When the electrolyte is low, replenish it with distilled water or a special replenishing fluid; 3. During daily driving, frequently check whether the small holes on the battery cover are ventilated; 4. Check for signs of oxidation on the battery's positive and negative terminals; 5. Inspect all parts of the circuit for any signs of aging or short circuits; 6. Turn off all electrical equipment when leaving the car.