Unit responded to dinner key marina anchorage mooring #36 reference a boat fire.  Upon arrival i observed vessel 1 had smoke coming out of the forward cabin.  Miami seatow was on scene with two of their boats pumping water into the vessel n an attempt to extinguish theh fire.  No one was onboard the vessel.  The fire was extinguished and vessel was left on scene.  Beleived fire started with battery charger connection.
MIAMI                         