As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING PREFLIGHT CHECK, FOUND THE EMERGENCY BATTERY CHARGER FAULT LIGHT ILLUMINATED DURING TAXI OUT. THE ACFT WAS REMOVED FROM SERVICE. R & R THE EMERGENCY BATTERY IAW EX-243185-RAI-10020-002. THE OPS CHECK WAS GOOD. THE ACFT WAS RETURNED TO SERVICE.