As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER TESTING EMER POWER BATTERY DID NOT SHOW CHARGING, NEITHER IN STEADY OR IN PULSE MODE. RAN EMER POWER FOR 1 MIN, THEN FOR 2 MIN, THEN FOR 3 MIN. BATTERY NEVER SHOWED ANY CHARGING. R & R BATTERY CHARGER & BOTH BATTERIES IAW AMM 24-30-02 & 24-30-01. OPERATIONS CHECKED GOOD IAW TASK CARD R0452401.