RedactedNarrative: Vessel 1 cruising at a slow speed in Squaw Bay on Lake Monona, when a warning light came on the dash of the vessel.  Vessel 1 Operator looked down and saw a battery malfunction light.  Vessel 1 Operator stated that he then pressed the throttle of the vessel slightly forward, the motor stuttered and then shut off.  Vessel 1 Operator stated that the motor then began to smoke.  Vessel 1 Operator stated that he moved everyone to the front the boat, a fire extinguisher was found and the fire was put out.