RedactedNarrative: ON 4/6/21 AT 1127 HOURS I WAS DISPATCHED IN REFERENCE TO A VESSEL FIRE. UPON ARRIVAL, THE FIRE DEPARTMENT WAS ON THE VESSEL CHECKING OUT THE FIRE WHICH HAD ALREADY BEEN PUT OUT BY A FRIEND OF THE BOAT OWNER, USING THE ONBOARD FIRE EXTINGUISHER AND HOSE. RP WAS WORKING IN THE BATTERY COMPARTMENT NEXT TO THE STEERING WHEEL AND SALON AREA. A ONE GALLON CAN OF KLEAN STRIP LACQUER THINNER SITTING ABOVE THE AREA FELL INTO THE BATTERY COMPARTMENT AND BLEW UP. THIS CAUSED THE OTHER BATTERIES TO BURN AS WELL. RP SAW WHAT HAPPENED AND PUT OUT THE FIRE WITH THE ONBOARD FIRE EXTINGUISHER THEN PROCEEDED TO USE THE HOSE. RP INHALED SOME SMOKE AND WAS CHECKED OUT BY EMS.