COOLING SYSTEM FOR WATERCRAFT

A watercraft battery cooling system comprises: a coolant channel through which coolant circulates to cool a battery ; a cooling water channel through which cooling water flows; and a heat exchanger for exchanging heat between the coolant and the cooling water. The cooling water channel includes a tank . The cooling system is configured such that, when a watercraft equipped with the system is on-water, the water can be stored in the tank , and that, when the watercraft is on land during battery charging, the water stored in the tank can be used to circulate through the cooling water channel as cooling water.