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Introduction The DongCheng Cordless Air Pump DCQE120 is one of the most versatile tools in the DongCheng lineup, valued for its compact design, rechargeable battery, digital display, and ability to inflate tires, mattresses, pool toys, and sports gear. While the DCQE120 is built for durability and ease of use, like any cordless device, it may occasionally face performance issues. Understanding these problems and knowing how to fix them ensures you can keep using your pump efficiently, whether yo …