If the color in the observation hole is green, the battery is in good condition. If it is black, it means that the battery capacity is not enough. If the inside has turned white, it means that the battery is dying and needs to be replaced in time.
The vehicle is more difficult to start than usual, and it is boring to start. Need to ignite many times, and feel that the starting power is insufficient. It is also possible to judge whether the battery needs to be replaced according to the color in the observation hole.