As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS NOT GROUNDED: AN EMERGENCY WAS DECLARED AND THE AIRCRAFT DIVERTED TO LAX DUE TO A BATTERY CHARGER LIMITER NR 2 (BCL2) FAULT ECAM MESSAGE. THE AIRCRAFT LANDED SAFELY WITHOUT FURTHER INCIDENT. MAINTENANCE REPLACED THE NR 2 ELECTRIC/BATTERY PUSH BUTTON SWITCH PER AMM 24-38-00 AND ESPM 24-45-11. A SATISFACTORY OPERATIONAL CHECK WAS ACCOMPLISHED WITH NO FAULT MESSAGE NOTED.