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The video focuses on several basic elements and concepts about batteries. First, it introduces what fuel measurement technology is, and explains the intrinsic relationship between shutdown voltage, discharge rate, temperature and battery age. Then four main battery-related definitions were listed: battery chemical capacity (Qmax), availability (Quse), and battery internal resistance, including three factors that affect internal resistance performance—state of charge (SOC), temperature, and aging. The relationship between the degree and the remaining battery capacity (RM).