What was found
EMERG EXIT SIGN/LIGHT: DURING FLIGHT THE CABIN EMERGENCY LIGHTS AND SIGNS WERE FLASHING. THEY THEN WENT OFF AND REMAINED OFF. LATER THE EMERGENCY LIGHTS AND SIGNS AGAIN ILLUMINATED AND STAYED ON. LATER THEY WENT OFF AND REMAINED OFF FOR THE REST OF THE FLIGHT. UPON ARRIVAL TO A/C TECHS ABLE TO VERIFY CREW SQUAWK. ACCOMPLISHED AMM 33-52-01-710-801-A. EMERGENCY BATTERY OPERATIONAL TEST AND FOUND FWD. EMERGENCY BATTERY (BATT 1) DISCHARGED. REPLACED AND EMERGENCY BATTERY IAW AMM 33-52-01. ACCOMPLISHED OPS CHECK. OPS CHECK GOOD.