Patent ID: 8140280

Claim:
A battery condition diagnosis apparatus for diagnosing a condition of a battery which supplies electrical power to a plurality of electrical control systems provided in a vehicle, comprising: electrification means for supplying electricity, in a predetermined manner, to a specific one of the plurality of electrical control systems when a predetermined time elapses after an ignition switch is turned off; electricity-supplied-amount detection means for detecting, as an electricity supplied amount, an amount of current flowing through the specific one of the plurality of electrical control systems; voltage change detection means for detecting a voltage change of the battery when the electrification means supplies electricity to the specific one of the plurality of electrical control systems; and battery condition diagnosis means for diagnosing the condition of the battery based on a detected electricity supplied amount and a detected voltage change of the battery, wherein the battery condition diagnosis apparatus determines, prior to a battery condition diagnosis, whether a diagnosis start condition is satisfied, and wherein at least one of a determination that an ignition key has been removed, a determination that a door of the vehicle has been opened and closed, and a determination that the door has been locked, satisfies the diagnosis start condition.