What was found
PILOT REPORTED INABILITY OF "SERIES" START WITH A/C. UPON INSPECTION FOUND + PIN OF RH BATTERY BROKEN OFF IN BATTERY CONNECTOR. INSPECTED LH BATTERY FOUND + PIN WITH PARTIAL BURN INDICATION. REMOVED TOPS OF BOTH BATTERIES AND NOTED INDICATION OF HIGH HEAT ABOVE CONNECTOR TERMINAL AREA. CONTACTED FSI MAINT TRAINING INSTRUCTOR, INDICATED SIMILAR CONDITION FOUND RECENTLY ON SAME TYPE PLANE AT EAGLE AVIATION. BATTERY CONNECTOR FOUND TO HAVE LOST TENSION ON CONNECTOR PINS. PREVIOUSLY DISCUSSED SIMILAR PROBLEM WITH GILL MANUFACTURING. TECHNICIAN SAID WITH LOOSE PINS IN CONNECTOR, CREATES HIGH RESISTANCE, WITH HIGH TEMP ON CONNECTOR AREA AND WILL CAUSE AREA TO CRACK DUE TO HEAT. REPLACED BOTH G-6381E BATTERI