RedactedNarrative: Owner/Operator and passenger launched vessel at Second Creek boat ramp.  Cranking battery was dead.  Owner jumped battery with jumper cables from trolling motor battery.  They traveled approx. 1/4 mile and started to smell smoke.  Passenger opened battery compartment and saw fire.  They traveled back to boat ramp and grounded the vessel, ran, and called 911.  See Acc. photos, Google Earth site photo, and Witness and Operator statement for details.  No injuries reported.