Abstract: A working machine includes a machine body, a front wheel and a rear wheel provided apart from each other in a front-rear direction of the machine body, a working portion provided between the front wheel and the rear wheel and including a power source and a cutter blade capable of being rotated around a rotary shaft by the power source, and a compaction roller provided between the front wheel and the rear wheel.

Abstract: A watercraft battery cooling system 1 comprises: a coolant channel 12 through which coolant circulates to cool a battery 5; a cooling water channel 13 through which cooling water flows; and a heat exchanger 14 for exchanging heat between the coolant and the cooling water. The cooling water channel 13 includes a tank 21. 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 21, and that, when the watercraft is on land during battery charging, the water stored in the tank 21 can be used to circulate through the cooling water channel 13 as cooling water.