Start-up possibility determining apparatus and start-up possibility determining method

A start-up possibility determining apparatus that determines whether an engine can be started up by driving a starter motor by electric power accumulated in a secondary battery, comprising:

• a dynamic internal resistance measuring unit that measures a dynamic internal resistance which is an internal resistance of the secondary battery while the engine is being started up by the starter motor;
• a static internal resistance measuring unit that measures a static internal resistance which is an internal resistance of the secondary battery when the engine is stopped;
• and
• a determining unit that determines possibility of a start-up of the engine by the secondary battery, based on a value obtained by a product of a ratio between a first static internal resistance which was measured by the static internal resistance measuring unit before or after a time of an engine start-up in the past and a second static internal resistance which was measured by the static internal resistance measuring unit within a predetermined time since a current point of time and the dynamic internal resistance measured by the dynamic internal resistance measuring unit at the time of the engine start-up in the past.