As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FIVE MINUTES AFTER TAKEOFF, EMERGENCY LIGHTS TURNED ON AND REMAINED ON FOR ABOUT 35 MINUTES. RESET CB4-C2 BREAKER. CHECKED CHARGER OUTPUT AT ALL FOUR PACKS AND FOUND OK. ALL ELBP'S DEAD. REMOVED AND REPLACED ALL ELBP'S. OPERATIONAL CHECKED GOOD IAW CRJ MM 33-51-04.