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Electrical capacitance characterizes the ability of a conductor, such as a capacitor, to accumulate an electrical charge used in an electrical circuit. The unit of measurement of capacitance is farad (F), which is equal to the ratio of 1 C (pendant) of electric charge to 1 V (volt) potential difference. In fact, farad is so large a value that capacitance is usually measured in smaller units, for example, in microfarads, which make up a millionth of a farad, or nanofarad - a billionth of a farad. And although to conduct accurate measurements can not do without expensive devices, using a digital multimeter, you can get an approximate value.
There is an opinion that a charging voltmeter for a normal battery charging voltage, an ammeter charging current ampere charge should be voltage and charge current 10% of its capacity voltmeter, voltage ie at the end of charging the battery capacity of the battery 50 battery voltage Amp * hours current battery capacity test charge will be the charger for the phone to be 5 ampere battery capacity. When the capacity of the battery such a battery charge conditions, a fully discharged battery will gain its capacity up to the nominal value of 10 hours. Imagine, you were brought from the wires of another car in the winter time, and in order to give the car battery a full charge, you need to drive a car for 10 hours, that is, to drive about five hundred kilometers. The normal battery life is more than five years. Used cars, driven from abroad, have on board fully working batteries of seven to nine years old. There, however, the storage conditions of cars are different, and the temperature in winter is more. There are three reasons for the low durability of the battery: violation of the battery charge mode, the quality of the battery, the human factor, in other words, laziness. Let's start with the first. If the battery is not charging at full capacity constantly, then the plates are subjected to the process of sulphation. Sulfation, or the formation of lead sulfate on the plates, can be compared with a stomach ulcer in humans, only in humans it can be treated, and a rechargeable ulcer can hardly be treated.

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