Watercraft with a cooling system

A watercraft comprising:

• a hull;
• a deck disposed above the hull;
• an electric propulsion system supported by at least one of the hull and the deck, the electric propulsion system including:
• a battery, and
• an electric motor electrically connected the battery;
• a cooling system including:
• a heat exchanger disposed in the hull, the heat exchanger including:
• a heat exchanger body including an outer surface arranged to contact water when the watercraft is in use,
• a first channel defined in the heat exchanger body, the first channel being in thermal contact with the outer surface for conducting heat therebetween, and
• a second channel defined in the heat exchanger body, the second channel being in thermal contact with the first channel for conducting heat therebetween;
• a first cooling path disposed at least partially between the hull and the deck, the first cooling path being in thermal contact with the battery, a portion of the first cooling path being defined by the first channel;
• and
• a second cooling path disposed at least partially between the hull and the deck, a portion of the second cooling path being defined by the second channel.

A method for charging a battery of a watercraft, the method comprising:

• connecting the battery to a power source, the watercraft not being in a body of water;
• supplying an open cooling path of the watercraft with a first coolant from an external coolant source;
• causing the first coolant to flow through the open cooling path;
• supplying power to the battery of the watercraft from an external power source to recharge the battery;
• and
• pumping a second coolant through a closed cooling path using a pump fluidly connected to the closed cooling path,
• the closed cooling path being in thermal contact with the battery and the open cooling path,
• the closed cooling path absorbing heat from the battery,
• the open cooling path absorbing heat from the closed cooling path.