Electric quantity monitoring devices and system

The utility model provides an electric quantity monitoring devices and system relates to power supply unit technical field, and the electric quantity monitoring devices include: power management means's one end and electric quantity detection equipment are connected, and the other end is connected with electric quantity reading device, electric quantity detection equipment detects the electric quantity of battery, obtains magnitude of voltage and/or current value, power management means stores and calculates according to magnitude of voltage and/or current value, obtains the battery power data, electric quantity reading device reads the battery power data, obtains electric quantity information, communications facilities and electric quantity reading device, power management means are connected, communications facilities at least an in to transmit magnitude of voltage, current value, electric quantity information, and it is limited to have solved the battery power supply time who existsamong the prior art, jus