As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING ANNUAL ELT PERFORMANCE TEST IT WAS FOUND THAT THE BATTERY VOLTAGE WOULD DOP BELOW MFG SPEC DURING TRANSMIT. UNDER TEST THE BATTERY VOLTAGE DROPPED TO 7.7 V WHILE THE CMM INDICATES 8.0 V AS THE MINIMUM. BATTERY WAS MARKED WITH EXPIRATION DATE OF FEBRUARY 2014.