As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
A STRONG ACIDIC ODOR WAS PRESENT AFTER REMOVING ELT BATTERY FROM ELT INSPECTION FOUND A THICK WHITE LIQUID ON THE NEGATIVE SIDE OF ONE BATTERY CELL. THE EXPIRATION DATE OF THE ELT BATTERY IS APRIL 2010 (4 MORE YEARS). THE ELT BATTERY OUTPUT IS 13.2 VOLTS. (K)