What was found
ONE HOUR INTO FLIGHT SMELLED AN ODOR IN COCKPIT, FOUND AIRCRAFT BATTERY SMOKING. DISCONNECTED CABLE, SMOKE STARTED TO SUBSIDE AND A/C RETURN TO LAX. MAINTENANCE FOUND GROUND WIRE BROKEN ON THE BATTERY TEMPERATURE PROTECTION CANNON PLUG. REPAIRED WIRE, REPLACED BATTERY AND CHARGER. OPS CHECK OK PER MM 24-31-01 PAGE 201 AND MM 24-31-02 PAGE 401. A/C RETURN TO SERVICE. REFERENCE TWRA97139.