1. Check the battery terminals for oxidation and treat them yourself if oxidation occurs.
2. Battery is low - use a car multimeter to measure battery voltage. If 12 volts is greater than 12 volts, it means there is no problem with the battery, otherwise it means the battery is damaged. .
3. There is a charging problem, that is, the generator is charging abnormally. Use a multimeter to measure the battery voltage while the car is running. If it is greater than 14 volts, it means it is present. no problem with the generator. If it's less than 14 volts, it's a problem with the generator.