As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EMERGENCY POWER TEST FAILS AFTER BATTERIES ARE CHANGED. REMOVED & REPLACED THE BATTERY CHARGER IAW AMM 24-34-03. CHARGER OPS CHECKED NORMAL. EMERGENCY POWER TEST FAILED. TROUBLESHOT IAW FIM 24-30-16. REMOVED AND REPLACED BATTERY SHUNT AND CLEANED TERMINALS IAW AMM 24-34-04-7. OPS CHECKED GOOD IAW AMM 24-34-02-5.