What was found
WITH THE AIRCRAFT POWERED UP AND THE EMERGENCY LIGHTS ARE IN THE ARM POSITION AND THE PAX SAFETY SWITCH IS TURNED ON, THE 3 EXIT LIGHTS DO NOT ILLUMINATE. WE RAN THE EMERGENCY LIGHTS FAILED PREFLIGHT TEST / RECHARGE PROCEDURE IN THE QRH (25X) WITH SAME RESULT. THE LIGHTS DO ILLUMINATE NORMALLY WHEN THE 3 EMERGENCY LIGHTS SWITCH IS IN THE ON POSITION AND ALSO WHEN THE AIRCRAFT IS POWERED DOWN COMPLETELY, THEY ILLUMINATE NORMALLY IN THE ARM POSITION. BUT, WITH POWER ON THE AIRCRAFT AND EMERGENCY LIGHT SWITCH IS IN THE ARM POSITION, AND PASSENGER SAFETY SWITCH IS ON, THE 3 EXIT LIGHTS DO NOT ILLUMINATE AS THEY NORMALLY DO. CORRECTIVE ACTION: SWAPPED #1 & #2 EMERGENCY BATTERY PACKS. PERFORMED TC-FLT-33-1001 EMERGENCY LIGHTING POWER SUPPLY BATTERY EXERCISE PROCEDURE. ALL OPS CHECK GOOD. WORK DONE IAW CE-700 AMM 33-50-00.