Device for detecting residual capacity of secondary battery

摘要

A secondary battery control device includes a secondary battery section, a current converting section for converting current inputted or outputted to the secondary battery section from direct current to alternating current or vice versa, and a charge and discharge control section for controlling an input and an output as monitoring the state of the secondary battery section. The secondary battery control device is characterized in that the secondary battery section is arranged to have a main battery, an auxiliary battery connected in parallel to the main battery, an operating section for operating a residual capacity of the main battery by detecting a voltage of the auxiliary battery, and an indicator for indicating the residual capacity outputted from the operating section.