The reason why iphone5 battery capacity is used less and less

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The battery charger generally uses imported power modules, which is currently the most innovative intelligent automatic charging of high-frequency electronic circuits in China. Low loss and high efficiency. Suitable for charging 12V and 24V batteries, the charger also has anti-reverse connection function. If there is no connection or reverse polarity voltage output, only correct connection can work normally, and it also has over-voltage, over-current, over-temperature protection functions.

Battery type and daily maintenance

At present, the batteries we use are mainly divided into three categories, namely ordinary batteries, dry-charged batteries and maintenance-free batteries.

Dry-charged battery: its full name is dry-charged lead-acid battery. Its main feature is that the negative electrode plate has a higher storage capacity. In a completely dry state, the generated power can be stored for two years. When used, only The electrolyte needs to be added, so it can be used after 20 to 30 minutes. In addition, do not place metal objects on the battery to prevent short circuits. In order to prevent oxidation of the terminals, protective agents such as petroleum jelly can be applied. The resistance of these materials is very large and must be removed in time. Otherwise it will affect the battery life for many reasons

The capacity of the battery and the service life of several cases have caused the battery capacity to be insufficient, mainly divided into the following aspects 1) The battery arrives at the user's foreign country and is installed in time after leaving the factory, resulting in long-term storage. The self-discharge of the high and low temperature resistant battery has a significant impact. Long-term storage It is bound to cause self-discharge to cause insufficient capacity. The active material of the positive electrode lead plate falls off and softens the active material existing in the large pores and the payment pores. The large pore diameter exceeds 0.5cm, it is composed of many small pores in the microstructure, and with the discharge cycle, the active surface shrinks to form the core by the coral type In the structure, the cluster discharge cycle used adds multiple small holes, so that the large holes increase the destruction of the cathode structure, resulting in the extinction of activity. The corrosion rate of the positive grid corrosion deformation grid depends on the composition of the alloy grid, but the higher the storage temperature, the faster the corrosion, the deeper the deep discharge, and the more serious the corrosion. White hard lead sulfate crystals are formed on the polar plate, and it is very difficult to convert lead sulfate into active substance when charging. This is lead sulfate salification, referred to as "sulfidation". In this way, the particles once precipitated grow and develop again and again due to temperature fluctuations, and the crystal grains increase. Therefore, it becomes the cause of a reduction in capacity and a shortened life.

The recrystallization of lead sulfate makes the crystal larger because of the tendency of the polycrystalline system and the reduction of its surface free energy. Slight battery vulcanization can still be restored by some methods. In severe cases, the general charging method cannot restore capacity. Of course, if the battery loses water and the positive plate softens, it also has this external characteristic.

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