As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THIS ELT HAS HAD 2 BATTERY PACKS CORRODE AND DAMAGE ELT IN THE LAST 2 YEARS AND HAS BEEN RETURNED TO FACTORY FOR REPAIR. FACTORY INSTALLED BATTERIES. ANOTHER LIKE UNIT HAS HAD 3 BATTERIES CORRODE AND DAMAGE UNIT IN PAST 3 YEARS, 2 OF THOSE BATTERIES WERE FACTORY INSTALLED.