During charging and discharging, the battery generates and disappears a certain amount of material in the plate and electrolyte when the battery passes a certain amount of electricity. This shows that in the process of charging and discharging, the larger the material that is generated and disappeared, the more power it passes through and the larger the capacity of the battery. Conversely, the smaller the battery, the smaller the battery capacity. That is to say the Lead - acid battery capacity depends on to take part in a chemical reaction active substances (Lead dioxide, down Lead and sulfuric acid solution), increase the number of active substances in chemical reactions, the most effective way is a big plate area. Due to the increase of the plate area and the large area of the electrolyte solution, the battery capacity is large, which increases the volume of the battery, so the larger the size of the battery, the larger the capacity, which is the principle of the lead-acid battery.
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