Definition: The electrode is mainly made of lead and its oxide, and the electrolyte is a kind of storage battery of sulfuric acid solution. English: Lead-acid battery. In the discharge state, the main component of the positive electrode is lead dioxide, and the main component of the negative electrode is lead. In the charged state, the main components of the positive and negative electrodes are lead sulfate. Divided into lead-acid water batteries and lead-acid maintenance-free batteries.

Lead-acid water battery is also called lead-acid battery. Its electrode is composed of lead and lead oxide. The electrolyte is an aqueous solution of sulfuric acid. The main advantages are the voltage stability and the low price; the disadvantages are the low specific energy (ie the electrical energy stored per kg of battery), the short service life and frequent maintenance. Old-fashioned ordinary batteries generally have a lifespan of about 2 years, and they need to regularly check the height of the electrolyte and add distilled water. However, with the development of technology, the average battery life becomes longer and maintenance is easier.

The most obvious feature of a lead-acid battery is that it has six twistable plastic sealing caps on top and vent holes on it. These seal caps are used for filling, checking electrolytes and venting gases. In theory, lead-acid batteries need to check the height of the electrolyte during each maintenance and add distilled water if there is a shortage. However, with the upgrading of battery manufacturing technology, lead-acid batteries have developed into maintenance-free lead-acid batteries, which do not require the addition of electrolyte or distilled water. The main use of charge and discharge to achieve water decomposition cycle. Lead-acid water batteries are mostly used in tricycles, while maintenance-free lead-acid batteries have a wider range of applications, including uninterruptible power supplies and electric vehicles. Lead-acid batteries can be divided into constant current discharge (such as uninterrupted power supply) and instantaneous discharge (such as automotive starter battery) according to application requirements.