What was found
AFTER DEPARTURE LAX (LAX-LHR), CREW RECEIVED MESSAGE OF MAIN BATTERY FAILURE. AIRCRAFT RETURNED TO LAX. *S/D* BOTH THE MAIN BATTERY AND THE MAIN BATTERY CHARGER SHOWED MAINTENANCE MESSAGES SAYING THEY WERE DEFECTIVE. REPLACED BOTH THE MAIN BATTERY (263BA101-2) AND THE MAIN BATTERY CHARGER. THE AIRCRAFT WAS RETURNED TO SERVICE WITH NO FURTHER INCIDENTS. SHOP FINDINGS FOR THE CHARGER SHOWED NORMAL OPERATION. BATTERY ANALYSIS TO FOLLOW.