<p>Provided is a secondary battery system equipped with a secondary battery charging control system capable of suppressing the degradation of a secondary battery while maintaining the effect of the improvement of energy efficiency and of reducing the running cost of the whole vehicle system by extending the replacement period of the secondary battery. The secondary battery system has: a secondary battery; a vehicle mounted with the secondary battery; a position detection means for detecting the position of the vehicle; and a control means for charging the secondary battery from the current position to predetermined passing position of the vehicle at a current value calculated based on the electric charge stored in the secondary battery at the current position of the vehicle detected by the position detection means, the estimated electric charge stored in the secondary battery at the predetermined passing position of the vehicle, and the time required from the current position to predetermined passing position of the vehicle.</p>
