What was found
EMERGENCY LIGHTS TEST FAILS IN THE MORNING FOR FIRST FLIGHT. QRH PROCEDURE COMPLETED AND TAKES A CHARGE. AFTER AN OVERNIGHT FAILS TEST AGAIN. ACCESSED & REMOVED NR 1 BATTERY & INSTALLED A NEW BATTERY. NO DEFECTS NOTED. OPS CHKD GOOD. IAW MM 33-50-06. ACCESSED & REMOVED NR 2 EMERGENCY BATTERY & INSTALLED A NEW EMERGENCY BATTERY. NO DEFECTS NOTED. OPS CHKD GOOD IAW MM 33-50-06. ACCESSED & REMOVED NR 3 BATTERY & INSTALLED A NEW EMERGENCY BATTERY. NO DEFECTS NOTED. OPS CHKD GOOD IAW MM 33-50-06. ACCESSED & REMOVED NR 4 BATTERY & INSTALLED A NEW BATTERY. NO DEFECTS NOTED. OPS CHKD GOOD IAW MM 33-50-06.