The general battery/lead-acid battery
is composed of positive and negative plates, separators, casing, electrolyte and terminal posts, etc. The chemical reaction of its discharge depends on the active material of the positive plate (lead dioxide and lead) and the activity of the negative plate. The substance (sponge pure lead) is carried out under the action of electrolyte (dilute sulfuric acid solution). The grid of the electrode plate is made of lead-antimony alloy in traditional batteries, and the maintenance-free battery is made of lead-calcium alloy. The former uses antimony, and the rear Those who use calcium, this is the fundamental difference between the two. Different materials will produce different phenomena: traditional batteries will lose liquid during use. This is because the antimony on the grid will contaminate the spongy pure lead on the negative plate, which will reduce the reaction in the battery after being fully charged. The electromotive force causes excessive decomposition of water, and a large amount of oxygen and hydrogen escape from the positive and negative plates respectively, reducing the electrolyte. Replacing antimony with calcium can change the back electromotive force of the fully charged battery, reduce the overcharge current, and reduce the speed of liquid vaporization, thereby reducing the loss of electrolyte. Since the maintenance-free battery uses a lead-calcium alloy grid, the amount of water decomposition generated during charging is low, and the amount of water evaporation is low. In addition, the sealed structure of the shell also releases less sulfuric acid gas. Therefore, compared with traditional batteries, It has the advantages of no need to add any liquid, less corrosion to the terminal posts and wires, strong resistance to overcharge, large starting current, and long power storage time. The maintenance-free storage battery only produces a small amount of gas under the normal charging voltage. The plate has strong resistance to overcharging, and has the characteristics of low internal resistance, good low-temperature starting performance, and longer service life than conventional batteries. Therefore, there is no need to add distilled water during the entire use period, and under normal conditions of the charging system, there is no need to remove it for supplementary charging. However, the specific gravity of the electrolyte should be checked during maintenance. 12V maintenance-free storage battery Most maintenance-free storage batteries are equipped with a hole-shaped liquid (temperature-compensated) hydrometer on the cover, which changes color according to the change in the specific gravity of the electrolyte. It can indicate the storage state of the battery and the height of the electrolyte level. When the indicator eye of the hydrometer is green, it indicates that the battery is fully charged and the battery is normal; when the indicator eye has few green dots or is black, it indicates that the battery needs to be charged; when the indicator eye is light yellow, it indicates that the battery is faulty and needs to be repaired or repaired. Replace it. When conditions permit, the maintenance-free storage battery can be charged with a charging device with current-voltage characteristics. The device can ensure sufficient power and avoid excessive water consumption due to overcharging. Generally, this kind of maintenance-free battery can be stored for 10 months from the factory to the use, and its voltage and capacitance remain unchanged, and the voltage and capacitance of the poor quality battery will drop about 3 months after leaving the factory. At the time of purchase, you can check whether the voltage and capacitance of the battery meet the requirements in the instruction manual. If the voltage and capacitance of the battery are reduced, it means that the material in it is not good. Then the battery The quality is definitely not good, it may be disguised after being charged by the dealer.
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