As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE DOING THE POWER ON CHECKLIST EMER LIGHTS SWITCH TO ON WE GOT NO EMERG LIGHTS ON INTHE CABIN. PERFORMED THE 30 MINUTE CHARGE PROCEDURE IN THE QRH 25X THEN RECHECKED THE LIGHTS AND THEY WORKED AFTER 30 MINUTES OF CHARGE. REMOVED AND REPLACED #1 AND #4 EMERGENCY BATTERY #1.