What are the methods for charging a car battery at home?

[StMadeline]

Methods for charging a car battery at home are: 1. Start the engine and use the car's alternator to charge the battery; 2. Use a portable external charger to charge the battery. Battery maintenance methods include: 1. Start the car regularly to charge the battery; 2. Add distilled water or special replenishing fluid when electrolyte is low; 3. Frequently check if the small holes on the battery cover are ventilated during daily driving; 4. Check for signs of oxidation on the battery's positive and negative terminals; 5. Inspect all parts of the circuit for aging or short circuits; 6. Turn off electrical equipment when leaving the car. 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 off or at low idle, it powers the car's electrical equipment; 3. It can assist in powering electrical equipment when the alternator's output is insufficient; 4. It mitigates voltage surges in the electrical system, protecting the car's electronic devices; 5. It can store excess electricity generated by the alternator.