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The battery plays an important role in the use of the car, if it can not supply the normal power supply, the starting opportunity can not start normally, causing the vehicle to be unable to drive, and the electrical system on the car will also follow problems or stop working. Therefore, batteries become an important component in the daily use of automobiles. At present, there are 2 kinds of batteries in the market, that is, traditional lead-acid batteries and maintenance free batteries. The vehicle maintenance free battery has the same working principle as the ordinary lead-acid battery, but the manufacturing process and material are different.