What was found
(LEAD ACID BATTERY) IN CRUISE, ENROUTE LOST (A) BUS IN FLIGHT. LOST ALL RADIOS, BOTH COMMS AND BOTH NAVS. OVERWEIGHT LANDING. RESET ALL MAIN FEEDER C/BS. OPS CHECKED GOOD ON GROUND RUN-UP. REMOVED AND REPLACED MAIN AIRCRAFT BATTERY CONNECTOR, OPS CHECKED GOOD COMPLIED WITH ONE - 119C, NO DEFECTS NOTED.