Why Carbon Batteries Have Self-discharge

The carbon battery charge retention capability refers to the ability of the carbon battery to store electricity under certain environmental conditions in an open circuit state. Self-discharge is mainly determined by factors such as carbon battery materials, manufacturing processes, and storage conditions. Generally, the higher the temperature, the greater the self-discharge rate. It is normal for a carbon battery to have a certain degree of self-discharge. During storage, the charged carbon battery will gradually decrease in capacity due to internal self-discharge. The reason is that the charged cathode active and sulfuric acid react to generate hydrogen gas and lose power. Generally, the higher the temperature and the larger the specific gravity, the larger the self-discharge amount. Under normal circumstances, the capacity of a carbon battery is reduced by about 2% every day, and it is not normal to exceed this value. The main reason for the self-discharge of the carbon battery is that the electrolyte is not pure or the concentration of sulfuric acid in the electrolyte in the monomer carbon battery is not uniform, especially the sulfuric acid sinking in the electrolyte, and the upper and lower concentration differences will cause the pole A potential difference is generated on the board to cause self-discharge.