Patent ID: 8368353

Claim:
A secondary battery device, comprising: an assembled battery including a plurality of secondary battery cells; a power source supply management unit configured to receive supply of a power source supply voltage from an external power source and turn on and off the supply of the power source supply voltage; and a control circuit configured to receive feed from the power source supply management unit and control an operation of the assembled battery and the power source supply management unit, the power source supply management unit including a timer configured to output an ON signal every period of time set by the control circuit, an OR circuit configured to receive supply of an output signal from the timer, an external signal supplied from outside, and a switching control signal output from the control circuit, and a switch circuit configured to switch output of the power source voltage from the external power source according to an output signal from the OR circuit, the control circuit receiving supply of the output signal from the timer and the signal supplied from the outside, turning on the switching control signal after confirming which of the output signal from the timer or the external signal has turned on the switch circuit and turning off the switching control signal when both of the output signal from the timer and the external signal are turned off.