How to judge whether the car needs to replace the battery?

1, as can be seen from the lights, if the lights are on, it means it is unnecessary, if it is dim, it means we need to replace them.

Judging from the sound of the horn, compared with the normal one just bought, our noise is loud and the sound is weak, which indicates that it needs to be replaced.

3. As can be seen from the power observation hole, it is green under normal circumstances, yellow stands for loss, and black stands for almost useless.

Extended data

brief introduction

Battery is a device that directly converts chemical energy into electrical energy. It is a rechargeable battery, which can be charged by reversible chemical reaction. Usually refers to lead-acid battery, which is a kind of battery and belongs to secondary battery. Its working principle: when charging, external electric energy is used to regenerate the internal active substances, and the electric energy is stored as chemical energy, and when it needs to be discharged, the chemical energy is converted into electric energy for output again, such as mobile phone batteries commonly used in life.

It uses a lead substrate grid filled with sponge lead as a negative electrode, a lead substrate grid filled with lead dioxide as a positive electrode, and dilute sulfuric acid with the density of1.26-1.33g/mlg/ml as an electrolyte. When the battery is discharged, metal lead is the negative electrode, and oxidation reaction occurs to generate lead sulfate; Lead dioxide is the positive electrode, and lead sulfate is generated by reduction reaction.

When the battery is charged with direct current, lead and lead dioxide are produced at the two poles respectively. After the power supply is removed, it returns to the state before discharge, forming a chemical battery. The lead-acid battery can be repeatedly charged and discharged, and its single cell voltage is 2V. A battery is a battery pack composed of one or more single cells, which is called battery for short. The most common battery is 6V, and there are other batteries of 2V, 4V, 8V and 24V. For example, the battery used in the car (commonly known as battery) is a battery pack with six lead batteries connected in series into 12V.

Baidu encyclopedia: storage battery