Due to its structural advantages, the maintenance-free battery consumes very little electrolyte and basically does not need to replenish distilled water during its service life. It also has the characteristics of shock resistance, high-temperature resistance, small size, and small self-discharge. The service life is generally twice that of ordinary batteries. There are also two types of maintenance-free batteries on the market: the first one requires no maintenance (adding supplementary fluid) after the one-time addition of electrolyte at the time of purchase; the other is that the battery itself has been added with electrolyte and sealed when it leaves the factory. , the user simply cannot add a refill. Within a reasonable period of use (usually 4 years), there is no need to add electrolytes or distilled water, less self-discharge, long storage time, long service life, low internal resistance, and good starting performance. More and more in the car use.

    Different materials will produce different phenomena: traditional batteries will reduce liquid during use, because the antimony on the grid will contaminate the sponge-like pure lead on the negative plate, weakening the reaction in the battery after full charging. The electromotive force causes excessive decomposition of water.

    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 liquid vaporization rate, thereby reducing the loss of electrolyte.

    Compared with traditional batteries, maintenance-free batteries do not need to add any liquid, have less corrosion to terminal piles and wires, have strong resistance to overcharging, large starting current, and a long storage time.