The utility model discloses an airtight lead acid battery of valve accuse maintains device on line for electric power, including singlechip, battery desulfurization prosthetic devices and change over switch controller, the output of change over switch controller passes through the input electric connection of AD converter and singlechip, the input of change over switch controller is connected with detection circuitry, internal resistance detection circuitry and temperature and humidity sensor respectively through the modulate circuit, detection circuitry and internal resistance detection circuitry and the input all with the airtight lead acid battery electric connection of valve accuse. The utility model relates to a rationally, can prolong the airtight plumbic acid of valve accuse and hold life, can control airtight lead acid battery's operating condition, the airtight lead acid battery's of valve accuse information such as electric quantity by all -round monitoring valve, but also can monitor the airtight lead acid battery of valve accuse through the singlechip through long -range monitor platform.