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Ordinary batteries are also called lead-acid batteries. Its electrodes are composed of lead and lead oxides, and the electrolyte is an aqueous solution of sulfuric acid. The main advantages are stable voltage and low price; the disadvantages are low specific energy (that is, the electric energy stored per kilogram of battery), short service life and frequent daily maintenance. Old-fashioned ordinary batteries generally have a lifespan of about 2 years, and it is necessary to regularly check the height of the electrolyte and add distilled water. However, with the development of technology, the current life of ordinary batteries has become longer and maintenance is easier.
The most obvious feature of a lead-acid battery is that there are 6 unscrewed plastic sealing covers on the top, and there are vent holes on the top. These sealing caps are used for filling, checking electrolyte and exhaust gas. Theoretically speaking, lead-acid batteries need to be checked for the height of the electrolyte during each maintenance, and distilled water should be added if there is a shortage. But with the upgrading of battery manufacturing technology, the maintenance of lead-acid batteries is no longer complicated. In normal use, there is no need to add electrolyte or distilled water to lead-acid batteries for 2-3 years. In other words, for the average car owner, if you don't take special maintenance on the lead-acid battery, it can also work normally for 2-3 years, and the lifespan is basically the same as the maintenance-free battery.
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