Lead acid battery (VRLA) is a type of battery with electrodes mainly made of lead and its oxides, and the electrolyte is a sulfuric acid solution. In the discharge state of lead-acid batteries, the main component of the positive electrode is lead dioxide, and the main component of the negative electrode is lead; In the charging state, the main component of the positive and negative electrodes is lead sulfate. The nominal voltage of a single cell lead-acid battery is 2.0V, which can discharge to 1.5V and charge to 2.4V; In applications, six single cell lead-acid batteries are often connected in series to form a nominal 12V lead-acid battery, as well as 24V, 36V, 48V, etc. The Frenchman Prandt invented lead-acid batteries in 1859, which has gone through nearly 150 years of development. Lead-acid batteries have made significant progress in theoretical research, product types and varieties, and electrical performance. Whether in transportation, communication, electricity, military, navigation, aviation and other economic fields, lead-acid batteries have played an indispensable and important role. According to the differences in structure and use of lead-acid batteries, they can be roughly divided into four categories: 1. lead-acid batteries for starting; 2. Lead acid batteries for power use; 3. Fixed valve controlled sealed lead-acid battery; 4. Other categories include small valve controlled sealed lead-acid batteries, lead-acid batteries for mining lamps, etc. The nominal voltage of a single cell lead-acid battery is 2.0V, which can discharge up to 1.5V and charge up to 2.4V. In applications, six single cell lead-acid batteries are often connected in series to form a nominal 12V lead-acid battery. There are also 24V, 36V, 48V, etc
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