If there is a problem with the battery, car owners do not have to worry. Common problems include reduced charge, self-discharge, failure to charge, etc. The fault diagnosis methods can be described in detail:

　　1. If the battery is fully charged or a good battery is used, it will run out of power after 1 to 2 days and the headlight will not light up. If the sound of the electric horn weakens or even makes a small sound, it can be regarded as the battery discharging itself. There are two main reasons: first, there are too many foreign objects accumulated at the bottom of the battery tank, forming a short circuit inside the battery; second, the battery shell is too dirty or too much electrolyte spilled during bumps, forming a short circuit between the cover and the pile head. Therefore, first check whether the battery surface is clean, whether the electrolyte overflows to form a conductive layer, and then check whether there is poor contact between the pile head and the wire, or poor grounding. The diagnosis method is: turn off the power switch, remove the negative terminal of the battery, and scratch it on the pole. If sparks occur at this moment, it means there is a short circuit inside the battery and it should be disassembled and inspected.

　　2. The battery cannot be charged, which means that when the engine and transmission parts are working normally, the voltage of the battery rises very slowly even though it has been charged for a long time. The main reasons why the battery cannot be charged are: ① loose connections in the charging circuit, poor contact due to corrosion, etc., which increase resistance and reduce current intensity; ② rectifier failure or diode short circuit; ③ battery plates are vulcanized, causing Its surface is attached with a layer of white lead sulfate grains with poor electrical conductivity. ④ The battery plates are damaged due to reasons such as using a large current to charge the battery or discharging the battery, or the density of the electrolyte is too high and the liquid level is not high enough.

　　Understanding these simple common sense can help car owners have some understanding of battery problems, and they can solve the problems easily and no longer be troubled by battery problems.

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